1210
1,210 is the partner of 1,184 in the second-smallest amicable pair.
- Even
- Composite
Why 1210 is special
The proper divisors of each sum to the other. That the pair sits so close to 1,000 and stayed unnoticed until 1866 says more about how the search was conducted than about the numbers.
Factors & digit properties
- Divisors (12)
- 1, 2, 5, 10, 11, 22, 55, 110, 121, 242, 605, 1210
- Prime factorisation
- 2 × 5 × 11^2
- Digit sum
- 4
- Digital root
- 4
Representations
- Decimal
- 1210
- Binary
- 10010111010
- Octal
- 2272
- Hexadecimal
- 4ba
- Roman numeral
- MCCX
- Scientific notation
- 1.210 × 10^3
Other mathematical patterns
- Deficient number
Mathematics
1,210's divisors sum to 1,184 and vice versa. Their smallness relative to when they were found reflects that earlier searches proceeded by formula rather than exhaustively, so numbers not fitting the formula were never tested.
DocumentedMathematics
Common questions
Is 1210 a prime number?
No, 1210 is not prime.
What are the factors of 1210?
The factors of 1210 are 1, 2, 5, 10, 11, 22, 55, 110, 121, 242, 605, 1210.
What is 1210 in Roman numerals?
1210 in Roman numerals is MCCX.
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