1210
1,210 is the partner of 1,184 in the second-smallest amicable pair.
- Even
- Composite
Where 1210 fits
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.
1210 is part of
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
- Scientific notation
- 1.210 × 10^3
Roman numerals
M C C X
Binary
1 0 0 1 0 1 1 1 0 1 0
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,210
Octal
2 2 7 2
2 × 512 + 2 × 64 + 7 × 8 + 2 × 1 = 1,210
Hexadecimal
4 b a
4 × 256 + b × 16 + a × 1 = 1,210
Read as powers of two: 1,024 + 128 + 32 + 16 + 8 + 2 = 1,210.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 1 hobble
1 × 1,000 + 2 × 100 + 1 × 10 = 1,210. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges (sixties place), 1 corner wedge (units place)
20 × 60 + 10 = 1210. 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
- Deficient number
Related numbers & connections
1210 is a year in the 13th century, in the 1210s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1210, Francis of Assisi's rule was approved orally by Innocent III (Italy).
DocumentedHistoryGeography: ItalyPeriod: 1210
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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026