1142
1142 is a year in the 12th century. Peter Abelard died at Cluny (France).
- Even
- Composite
Where 1142 fits
Why 1142 is special
1142 has a profile because of what happened in it rather than because of any property of the number: Peter Abelard died at Cluny (France).
1142 is part of
Factors & digit properties
- Divisors (4)
- 1, 2, 571, 1142
- Prime factorisation
- 2 × 571
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 1142
- Scientific notation
- 1.142 × 10^3
Roman numerals
M C X L I I
MCXLII uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 0 1 1 1 0 1 1 0
1 × 1,024 + 0 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 1,142
Octal
2 1 6 6
2 × 512 + 1 × 64 + 6 × 8 + 6 × 1 = 1,142
Hexadecimal
4 7 6
4 × 256 + 7 × 16 + 6 × 1 = 1,142
Read as powers of two: 1,024 + 64 + 32 + 16 + 4 + 2 = 1,142.
In historical numeral systems
Egyptian
1 lotus, 1 coil of rope, 4 hobbles, 2 strokes
1 × 1,000 + 1 × 100 + 4 × 10 + 2 × 1 = 1,142. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 9 vertical wedges (sixties place), 2 vertical wedges (units place)
19 × 60 + 2 = 1142. 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
- Semiprime
Related numbers & connections
1142 is a year in the 12th century, in the 1140s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1142, Peter Abelard died at Cluny (France).
DocumentedHistoryGeography: FrancePeriod: 1142
Common questions
Is 1142 a prime number?
No, 1142 is not prime.
What are the factors of 1142?
The factors of 1142 are 1, 2, 571, 1142.
What is 1142 in Roman numerals?
1142 in Roman numerals is MCXLII. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MCXXXXII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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