235
+235 is the international calling code for Chad.
- Odd
- Composite
Where 235 fits
Why 235 is special
Lake Chad has shrunk by roughly 90 percent since the 1960s, affecting the water supply of tens of millions across four countries.
Same number, different meanings
How 235 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Lake Chad has shrunk by roughly 90 percent since the 1960s, affecting the water supply of tens of millions across four countries.
- Science
Uranium-235 makes up about 0.72 percent of natural uranium. Reactor fuel is enriched to roughly 3 to 5 percent and weapons use far higher levels, which is why enrichment capacity is the central issue in nuclear proliferation.
- Geography
+235 reaches Chad. Lake Chad has lost the large majority of its surface area since the 1960s through drought and irrigation, which is among the clearest visible cases of large-scale hydrological change.
Factors & digit properties
- Divisors (4)
- 1, 5, 47, 235
- Prime factorisation
- 5 × 47
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 235
- Scientific notation
- 2.350 × 10^2
Roman numerals
C C X X X V
Binary
1 1 1 0 1 0 1 1
1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 235
Octal
3 5 3
3 × 64 + 5 × 8 + 3 × 1 = 235
Hexadecimal
e b
e × 16 + b × 1 = 235
Read as powers of two: 128 + 64 + 32 + 8 + 2 + 1 = 235.
In historical numeral systems
Egyptian
2 coils of rope, 3 hobbles, 5 strokes
2 × 100 + 3 × 10 + 5 × 1 = 235. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 vertical wedges (sixties place), 5 corner wedges + 5 vertical wedges (units place)
3 × 60 + 55 = 235. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sigma, then lambda, then epsilon, marked as a numeral
sigma-lambda-epsilon + keraia
sigma + lambda + epsilon written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
resh, then lamed, then he
resh-lamed-he
resh (200) + lamed (30) + he (5) = 235, written in descending order.
Maya
2 bars + 1 dot (upper, twenties place) over 3 bars (lower, units place)
11 × 20 + 15 = 235. 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
- Deficient number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
Chad and the Central African Republic are both landlocked and among the least connected countries by road anywhere.
View 236 →Nearby in a sequence
- is adjacent to236
why?
Strength 0.50, confidence "high".
Science
Uranium-235 makes up about 0.72 percent of natural uranium. Reactor fuel is enriched to roughly 3 to 5 percent and weapons use far higher levels, which is why enrichment capacity is the central issue in nuclear proliferation.
DocumentedScienceGeography: GlobalPeriod: 1935–
Geography
+235 reaches Chad. Lake Chad has lost the large majority of its surface area since the 1960s through drought and irrigation, which is among the clearest visible cases of large-scale hydrological change.
DocumentedGeographyGeography: Chad
Common questions
Is 235 a prime number?
No, 235 is not prime.
What are the factors of 235?
The factors of 235 are 1, 5, 47, 235.
What is 235 in Roman numerals?
235 in Roman numerals is CCXXXV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026