142,857
142,857 is a cyclic number: multiplying it by 1 through 6 produces the same digits in the same order, rotated.
- Odd
- Composite
Where 142,857 fits
Why 142,857 is special
142857 is the repeating block of 1/7, and it behaves like a wheel. Multiply by 2 and you get 285714; by 3, 428571 — the same six digits, started at a different point. Multiply by 7 and the pattern breaks into 999999, which is the reason it works at all. It is the smallest cyclic number, and every one after it comes from a similar prime reciprocal.
Factors & digit properties
- Divisors (32)
- 1, 3, 9, 11, 13, 27, 33, 37, 39, 99, 111, 117, 143, 297, 333, 351, 407, 429, 481, 999, 1221, 1287, 1443, 3663, 3861, 4329, 5291, 10989, 12987, 15873, 47619, 142857
- Prime factorisation
- 3^3 × 11 × 13 × 37
- Digit sum
- 27
- Digital root
- 9
Representations
- Decimal
- 142857
- Binary
- 100010111000001001
- Octal
- 427011
- Hexadecimal
- 22e09
- Scientific notation
- 1.429 × 10^5
Other mathematical patterns
- Deficient number
- Kaprekar number
- Harshad (Niven) number
Mathematics
142857 is the repeating block of 1/7. Multiplying by 2, 3, 4, 5 or 6 gives the same six digits starting at a different position, and multiplying by 7 gives 999999 — which is the reason for the whole effect, since 1/7 × 7 must return to a string of nines. It is the smallest cyclic number.
DocumentedMathematics
Common questions
Is 142,857 a prime number?
No, 142,857 is not prime.
What are the factors of 142,857?
The factors of 142,857 are 1, 3, 9, 11, 13, 27, 33, 37, 39, 99, 111, 117, 143, 297, 333, 351, 407, 429, 481, 999, 1221, 1287, 1443, 3663, 3861, 4329, 5291, 10989, 12987, 15873, 47619, 142857.
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