1218
1218 is a year in the 13th century. The Fifth Crusade attacked Damietta rather than Jerusalem, the first to strike at Egypt (Egypt).
- Even
- Composite
Where 1218 fits
Why 1218 is special
1218 has a profile because of what happened in it rather than because of any property of the number: the Fifth Crusade attacked Damietta rather than Jerusalem, the first to strike at Egypt (Egypt).
1218 is part of
Factors & digit properties
- Divisors (16)
- 1, 2, 3, 6, 7, 14, 21, 29, 42, 58, 87, 174, 203, 406, 609, 1218
- Prime factorisation
- 2 × 3 × 7 × 29
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 1218
- Scientific notation
- 1.218 × 10^3
Roman numerals
M C C X V I I I
Binary
1 0 0 1 1 0 0 0 0 1 0
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,218
Octal
2 3 0 2
2 × 512 + 3 × 64 + 0 × 8 + 2 × 1 = 1,218
Hexadecimal
4 c 2
4 × 256 + c × 16 + 2 × 1 = 1,218
Read as powers of two: 1,024 + 128 + 64 + 2 = 1,218.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 1 hobble, 8 strokes
1 × 1,000 + 2 × 100 + 1 × 10 + 8 × 1 = 1,218. 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 + 8 vertical wedges (units place)
20 × 60 + 18 = 1218. 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
- Abundant number
- Happy number
Related numbers & connections
1218 is a year in the 13th century, in the 1210s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1218, the Fifth Crusade attacked Damietta rather than Jerusalem, the first to strike at Egypt (Egypt).
DocumentedHistoryGeography: EgyptPeriod: 1218
Common questions
Is 1218 a prime number?
No, 1218 is not prime.
What are the factors of 1218?
The factors of 1218 are 1, 2, 3, 6, 7, 14, 21, 29, 42, 58, 87, 174, 203, 406, 609, 1218.
What is 1218 in Roman numerals?
1218 in Roman numerals is MCCXVIII.
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