1340
1340 is the year of the Battle of Sluys.
- Even
- Composite
Where 1340 fits
Why 1340 is special
An English naval victory gave control of the Channel early in the Hundred Years' War. Nobody dared tell the French king the result; his jester reportedly did it obliquely.
1340 is part of
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 5, 10, 20, 67, 134, 268, 335, 670, 1340
- Prime factorisation
- 2^2 × 5 × 67
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 1340
- Scientific notation
- 1.340 × 10^3
Roman numerals
M C C C X L
MCCCXL uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 1 0 0 1 1 1 1 0 0
1 × 1,024 + 0 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 1,340
Octal
2 4 7 4
2 × 512 + 4 × 64 + 7 × 8 + 4 × 1 = 1,340
Hexadecimal
5 3 c
5 × 256 + 3 × 16 + c × 1 = 1,340
Read as powers of two: 1,024 + 256 + 32 + 16 + 8 + 4 = 1,340.
In historical numeral systems
Egyptian
1 lotus, 3 coils of rope, 4 hobbles
1 × 1,000 + 3 × 100 + 4 × 10 = 1,340. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 2 vertical wedges (sixties place), 2 corner wedges (units place)
22 × 60 + 20 = 1340. 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
Related numbers & connections
1340 is a year in the 14th century, in the 1340s.
Sluys in 1340 gave England control of the Channel and La Rochelle in 1372 took it away, which is roughly how often it changed hands through the Hundred Years' War.
View 1372 →History
Sluys in 1340 destroyed the French fleet and gave England control of the Channel for years, which is why the war was fought almost entirely in France.
DocumentedHistoryGeography: FlandersPeriod: 1340In 1340, the English destroyed the French fleet at Sluys, giving England control of the Channel for a generation (Flanders).
DocumentedHistoryGeography: FlandersPeriod: 1340
Common questions
Is 1340 a prime number?
No, 1340 is not prime.
What are the factors of 1340?
The factors of 1340 are 1, 2, 4, 5, 10, 20, 67, 134, 268, 335, 670, 1340.
What is 1340 in Roman numerals?
1340 in Roman numerals is MCCCXL. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MCCCXXXX, 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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026