818
818 is the ISO 3166-1 numeric country code for Egypt.
- Even
- Composite
Where 818 fits
Why 818 is special
Egypt spans two continents, which several international classification systems handle differently. The numeric code identifies the state and leaves the continental question to whoever is asking.
818 is part of
Factors & digit properties
- Divisors (4)
- 1, 2, 409, 818
- Prime factorisation
- 2 × 409
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 818
- Scientific notation
- 8.180 × 10^2
Roman numerals
D C C C X V I I I
Binary
1 1 0 0 1 1 0 0 1 0
1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 818
Octal
1 4 6 2
1 × 512 + 4 × 64 + 6 × 8 + 2 × 1 = 818
Hexadecimal
3 3 2
3 × 256 + 3 × 16 + 2 × 1 = 818
Read as powers of two: 512 + 256 + 32 + 16 + 2 = 818.
In historical numeral systems
Egyptian
8 coils of rope, 1 hobble, 8 strokes
8 × 100 + 1 × 10 + 8 × 1 = 818. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 3 vertical wedges (sixties place), 3 corner wedges + 8 vertical wedges (units place)
13 × 60 + 38 = 818. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
omega, then iota, then eta, marked as a numeral
omega-iota-eta + keraia
omega + iota + eta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then tav, then yod, then het
tav-tav-yod-het
tav (400) + tav (400) + yod (10) + het (8) = 818, written in descending order.
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
- Semiprime
Related numbers & connections
Egypt's ISO numeric code and calling code. Classification systems disagree about whether Egypt is African or Asian; both identifiers are silent on it.
View 20 →Other connections
- is associated with20
why?
Strength 0.50, confidence "high".
Geography
818 is Egypt's ISO numeric code. Statistical systems disagree about whether Egypt is African or Asian, and the code is silent on it — identity and classification are deliberately separate.
DocumentedGeographyGeography: Egypt
Common questions
Is 818 a prime number?
No, 818 is not prime.
What are the factors of 818?
The factors of 818 are 1, 2, 409, 818.
What is 818 in Roman numerals?
818 in Roman numerals is DCCCXVIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026