12,742
Earth's mean diameter is about 12,742 km.
- Even
- Composite
Where 12,742 fits
Why 12,742 is special
A useful check on the figure: the metre was defined so that the pole-to-equator distance is ten million metres, which makes the circumference 40,000 km, and dividing by pi gives 12,732 — within a tenth of a percent of the real value.
Factors & digit properties
- Divisors (8)
- 1, 2, 23, 46, 277, 554, 6371, 12742
- Prime factorisation
- 2 × 23 × 277
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 12742
- Binary
- 11000111000110
- Octal
- 30706
- Hexadecimal
- 31c6
- Scientific notation
- 1.274 × 10^4
Other mathematical patterns
- Deficient number
Related numbers & connections
The mean diameter is twice the mean radius, and both can be checked against the definition of the metre — which put the pole-to-equator distance at ten million metres.
View 6378 →Mathematically related
- has multiple6378
why?
Strength 0.50, confidence "high".
Geography
Earth averages about 12,742 km across. The metre was defined to make the pole-to-equator distance ten million metres, so the circumference is 40,000 km and dividing by pi gives 12,732 — within a tenth of a percent of the measured value.
DocumentedGeography
Common questions
Is 12,742 a prime number?
No, 12,742 is not prime.
What are the factors of 12,742?
The factors of 12,742 are 1, 2, 23, 46, 277, 554, 6371, 12742.
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