2540
Lake Baikal is about 2,540 km around and holds a fifth of the world's unfrozen fresh water.
- Even
- Composite
Where 2540 fits
Why 2540 is special
It is the deepest and oldest lake on Earth, at around 25 million years, and contains more water than all the North American Great Lakes combined.
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 5, 10, 20, 127, 254, 508, 635, 1270, 2540
- Prime factorisation
- 2^2 × 5 × 127
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 2540
- Scientific notation
- 2.540 × 10^3
Roman numerals
M M D X L
MMDXL uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 1 1 1 1 0 1 1 0 0
1 × 2,048 + 0 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 2,540
Octal
4 7 5 4
4 × 512 + 7 × 64 + 5 × 8 + 4 × 1 = 2,540
Hexadecimal
9 e c
9 × 256 + e × 16 + c × 1 = 2,540
Read as powers of two: 2,048 + 256 + 128 + 64 + 32 + 8 + 4 = 2,540.
In historical numeral systems
Egyptian
2 lotuses, 5 coils of rope, 4 hobbles
2 × 1,000 + 5 × 100 + 4 × 10 = 2,540. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 corner wedges + 2 vertical wedges (sixties place), 2 corner wedges (units place)
42 × 60 + 20 = 2540. Places are separated by a space on the tablet, with the higher place written first.
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
- Abundant number
Related numbers & connections
Lake Baikal is the deepest lake and Challenger Deep the deepest point of the ocean. Both figures are quoted more confidently than the surveys support.
View 10994 →Other connections
- is associated with10994
why?
Strength 0.50, confidence "high".
Geography
Baikal holds about 20 percent of Earth's unfrozen surface fresh water — more than all five Great Lakes together — in a single rift lake around 25 million years old.
DocumentedGeographyGeography: Russia
Common questions
Is 2540 a prime number?
No, 2540 is not prime.
What are the factors of 2540?
The factors of 2540 are 1, 2, 4, 5, 10, 20, 127, 254, 508, 635, 1270, 2540.
What is 2540 in Roman numerals?
2540 in Roman numerals is MMDXL. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MMDXXXX, 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: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026