40,075
Earth's circumference at the equator is about 40,075 km.
- Odd
- Composite
Where 40,075 fits
Why 40,075 is special
The roundness of that figure is not a coincidence: the metre was originally defined so that the distance from the pole to the equator would be exactly ten million metres, making the circumference 40,000 km by construction. The extra 75 km is the equatorial bulge.
Factors & digit properties
- Divisors (12)
- 1, 5, 7, 25, 35, 175, 229, 1145, 1603, 5725, 8015, 40075
- Prime factorisation
- 5^2 × 7 × 229
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 40075
- Binary
- 1001110010001011
- Octal
- 116213
- Hexadecimal
- 9c8b
- Scientific notation
- 4.008 × 10^4
Other mathematical patterns
- Deficient number
Related numbers & connections
The same equatorial circumference in miles and kilometres. One figure is nearly round and the other is not, because the metre was defined against the Earth and the mile was not.
View 24901 →Geography
Earth's equatorial circumference is about 40,075 km, and the near-roundness is deliberate: the metre was originally defined so the pole-to-equator distance would be exactly ten million metres. The 75 km of excess is the equatorial bulge, which the original definition did not account for.
DocumentedGeography
Common questions
Is 40,075 a prime number?
No, 40,075 is not prime.
What are the factors of 40,075?
The factors of 40,075 are 1, 5, 7, 25, 35, 175, 229, 1145, 1603, 5725, 8015, 40075.
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: 3 August 2026