1287
1287 is a year in the 13th century. The St Lucia's flood drowned tens of thousands and opened the Zuiderzee (Low Countries).
- Odd
- Composite
Where 1287 fits
Why 1287 is special
1287 has a profile because of what happened in it rather than because of any property of the number: the St Lucia's flood drowned tens of thousands and opened the Zuiderzee (Low Countries).
1287 is part of
Factors & digit properties
- Divisors (12)
- 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429, 1287
- Prime factorisation
- 3^2 × 11 × 13
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 1287
- Scientific notation
- 1.287 × 10^3
Roman numerals
M C C L X X X V I I
Binary
1 0 1 0 0 0 0 0 1 1 1
1 × 1,024 + 0 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,287
Octal
2 4 0 7
2 × 512 + 4 × 64 + 0 × 8 + 7 × 1 = 1,287
Hexadecimal
5 0 7
5 × 256 + 0 × 16 + 7 × 1 = 1,287
Read as powers of two: 1,024 + 256 + 4 + 2 + 1 = 1,287.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 8 hobbles, 7 strokes
1 × 1,000 + 2 × 100 + 8 × 10 + 7 × 1 = 1,287. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 1 vertical wedge (sixties place), 2 corner wedges + 7 vertical wedges (units place)
21 × 60 + 27 = 1287. 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
1287 is a year in the 13th century, in the 1280s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1287, the St Lucia's flood drowned tens of thousands and opened the Zuiderzee (Low Countries).
DocumentedHistoryGeography: Low CountriesPeriod: 1287
Common questions
Is 1287 a prime number?
No, 1287 is not prime.
What are the factors of 1287?
The factors of 1287 are 1, 3, 9, 11, 13, 33, 39, 99, 117, 143, 429, 1287.
What is 1287 in Roman numerals?
1287 in Roman numerals is MCCLXXXVII.
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: 15 July 2026