2440
Mercury's radius is about 2,440 km.
- Even
- Composite
Where 2440 fits
Why 2440 is special
Mercury is smaller than two moons in the solar system, Ganymede and Titan. It has almost no atmosphere and the largest temperature range of any planet, from about 430 degrees Celsius in sunlight to minus 180 in shadow.
Same number, different meanings
How 2440 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Mercury is smaller than two moons in the solar system, Ganymede and Titan. It has almost no atmosphere and the largest temperature range of any planet, from about 430 degrees Celsius in sunlight to minus 180 in shadow.
- History
Mariner 10 flew past Mercury three times in 1974 and 1975, but its orbit brought it back to the same sunlit face each time, so it photographed under half the surface. The rest was blank on every map for thirty-five years, until MESSENGER entered orbit in 2011. Mercury is the closest planet to have been mapped last, because getting into orbit around it requires shedding far more speed than reaching it does.
- Science
Mercury is smaller than Ganymede and Titan. With almost no atmosphere to move heat around, its surface ranges from about 430 degrees Celsius in sunlight to about minus 180 in shadow — the widest span of any planet.
Factors & digit properties
- Divisors (16)
- 1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440
- Prime factorisation
- 2^3 × 5 × 61
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 2440
- Scientific notation
- 2.440 × 10^3
Roman numerals
M M C D X L
MMCDXL uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 1 1 0 0 0 1 0 0 0
1 × 2,048 + 0 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 2,440
Octal
4 6 1 0
4 × 512 + 6 × 64 + 1 × 8 + 0 × 1 = 2,440
Hexadecimal
9 8 8
9 × 256 + 8 × 16 + 8 × 1 = 2,440
Read as powers of two: 2,048 + 256 + 128 + 8 = 2,440.
In historical numeral systems
Egyptian
2 lotuses, 4 coils of rope, 4 hobbles
2 × 1,000 + 4 × 100 + 4 × 10 = 2,440. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 corner wedges (sixties place), 4 corner wedges (units place)
40 × 60 + 40 = 2440. 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
- Harshad (Niven) number
Related numbers & connections
Mercury and Venus. Mercury is smaller than two moons in the solar system; Venus is nearly Earth's size and hotter than Mercury despite being further from the Sun.
View 6052 →Other connections
- contrasts with6052
why?
Strength 0.50, confidence "high".
History
Mariner 10 flew past Mercury three times in 1974 and 1975, but its orbit brought it back to the same sunlit face each time, so it photographed under half the surface. The rest was blank on every map for thirty-five years, until MESSENGER entered orbit in 2011. Mercury is the closest planet to have been mapped last, because getting into orbit around it requires shedding far more speed than reaching it does.
DocumentedHistoryPeriod: 1974–2011
Science
Mercury is smaller than Ganymede and Titan. With almost no atmosphere to move heat around, its surface ranges from about 430 degrees Celsius in sunlight to about minus 180 in shadow — the widest span of any planet.
DocumentedScience
Common questions
Is 2440 a prime number?
No, 2440 is not prime.
What are the factors of 2440?
The factors of 2440 are 1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440.
What is 2440 in Roman numerals?
2440 in Roman numerals is MMCDXL. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MMCCCCXXXX, 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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026