44
+44 is the international dialling code for the United Kingdom. 44 is also the number of ways five people can draw names so that nobody draws themselves, and the atomic number of ruthenium.
- Even
- Composite
Where 44 fits
Why 44 is special
44 (2² × 11) is a quieter number, its clearest mathematical interest being its position squarely between two notable squares.
Same number, different meanings
How 44 is understood across different contexts — never implying one meaning because of another.
- Mathematics
44 (2² × 11) is a quieter number, its clearest mathematical interest being its position squarely between two notable squares.
- Everyday life
There are roughly 44 phonemes in English, on the most common count (Received Pronunciation; counts differ by accent and by analysis). Written with 26 letters, which is why English spelling needs digraphs like 'sh' and 'th' and why phonics teaching lists more sounds than letters.
- Geography
+44 reaches the United Kingdom, and the codes were not allocated arbitrarily: the shortest — 1 and 7 — went to the largest single-country networks, and Europe took most of the 3x and 4x range. A UK number written for international dialling drops the leading 0 after the code, which is the most common mistake in printed contact details.
- Science
44 is the atomic number of ruthenium, a hard platinum-group metal used in tiny quantities to harden electrical contacts and as a catalyst in industrial chemistry.
44 is part of
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 11, 22, 44
- Prime factorisation
- 2^2 × 11
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 44
- Scientific notation
- 4.400 × 10^1
Roman numerals
X L I V
XLIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 0 1 1 0 0
1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 44
Octal
5 4
5 × 8 + 4 × 1 = 44
Hexadecimal
2 c
2 × 16 + c × 1 = 44
Read as powers of two: 32 + 8 + 4 = 44.
In historical numeral systems
Egyptian
4 hobbles, 4 strokes
4 × 10 + 4 × 1 = 44. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 corner wedges + 4 vertical wedges
44 fits in a single sexagesimal place: 4 corner wedges + 4 vertical wedges.
Greek (Ionic)
mu, then delta, marked as a numeral
mu-delta + keraia
mu + delta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
mem, then dalet
mem-dalet
mem (40) + dalet (4) = 44, written in descending order.
Chinese numerals
sì shí sì
sì shí sì
四 before 十 multiplies it: 4 tens. 四 after it adds 4. The written form mirrors the arithmetic — "sì shí sì". The financial (anti-fraud) form is 肆拾肆.
Maya
2 dots (upper, twenties place) over 4 dots (lower, units place)
2 × 20 + 4 = 44. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Palindromic number
- Deficient number
- Happy number
- Repdigit
Related numbers & connections
11 is a factor of 44 (11 × 4 = 44).
View 11 →Two numbers identifying the United Kingdom in different international systems: 826 in ISO 3166 and +44 in the telephone plan. Neither derives from the other, and both exist because a country needs an identifier that survives translation.
View 826 →Mathematically related
Everyday life
There are roughly 44 phonemes in English, on the most common count (Received Pronunciation; counts differ by accent and by analysis). Written with 26 letters, which is why English spelling needs digraphs like 'sh' and 'th' and why phonics teaching lists more sounds than letters.
DocumentedEveryday lifeGeography: Received Pronunciation; counts differ by accent and by analysis
Geography
+44 reaches the United Kingdom, and the codes were not allocated arbitrarily: the shortest — 1 and 7 — went to the largest single-country networks, and Europe took most of the 3x and 4x range. A UK number written for international dialling drops the leading 0 after the code, which is the most common mistake in printed contact details.
DocumentedGeographyGeography: United Kingdom
Mathematics
Five objects can be rearranged so that none ends up in its original position in exactly 44 ways. Such a rearrangement is called a derangement, and the count answers the classic question of how many ways a group can draw names for a gift exchange with nobody drawing themselves.
DocumentedMathematics44 sits between the perfect squares 36 and 49, and factors as 2² × 11.
DocumentedMathematics
Science
44 is the atomic number of ruthenium, a hard platinum-group metal used in tiny quantities to harden electrical contacts and as a catalyst in industrial chemistry.
DocumentedScience
Common questions
What is a derangement?
A rearrangement where nothing ends up where it started. Five objects can be deranged in exactly 44 ways — which answers the practical version of the question: how many ways a group of five can draw names for a gift exchange with nobody drawing themselves.
Is 44 a prime number?
No, 44 is not prime.
What are the factors of 44?
The factors of 44 are 1, 2, 4, 11, 22, 44.
What is 44 in Roman numerals?
44 in Roman numerals is XLIV. IV is subtractive: one before five — five minus one. Written additively it would be XXXXIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 5 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026