1347
1347 is the year the Black Death reached Europe.
- Odd
- Composite
Where 1347 fits
Why 1347 is special
It arrived at Sicilian ports in October 1347 and killed perhaps a third to a half of Europe's population within five years. The resulting labour shortage raised wages and weakened serfdom, which is why the pandemic appears in economic history as well as medical history.
1347 is part of
Factors & digit properties
- Divisors (4)
- 1, 3, 449, 1347
- Prime factorisation
- 3 × 449
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 1347
- Scientific notation
- 1.347 × 10^3
Roman numerals
M C C C X L V I I
MCCCXLVII uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 1 0 1 0 0 0 0 1 1
1 × 1,024 + 0 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,347
Octal
2 5 0 3
2 × 512 + 5 × 64 + 0 × 8 + 3 × 1 = 1,347
Hexadecimal
5 4 3
5 × 256 + 4 × 16 + 3 × 1 = 1,347
Read as powers of two: 1,024 + 256 + 64 + 2 + 1 = 1,347.
In historical numeral systems
Egyptian
1 lotus, 3 coils of rope, 4 hobbles, 7 strokes
1 × 1,000 + 3 × 100 + 4 × 10 + 7 × 1 = 1,347. 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 + 7 vertical wedges (units place)
22 × 60 + 27 = 1347. 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
1347 is a year in the 14th century, in the 1340s.
Two plague outbreaks 300 years apart. The fourteenth-century pandemic killed a third to a half of Europe; the seventeenth-century London outbreak was a local recurrence of the same disease.
View 1665 →History
Plague reached Sicilian ports in 1347 and killed perhaps a third to a half of Europe's population within five years. The shortage of labour that followed raised wages and weakened serfdom, which is why the pandemic belongs to economic history as much as to medical history.
DocumentedHistoryGeography: EuropePeriod: 1347–1352In 1347, the Black Death reached Mediterranean ports and spread north, killing between a third and a half of Europe within four years (Europe).
DocumentedHistoryGeography: EuropePeriod: 1347
Common questions
Is 1347 a prime number?
No, 1347 is not prime.
What are the factors of 1347?
The factors of 1347 are 1, 3, 449, 1347.
What is 1347 in Roman numerals?
1347 in Roman numerals is MCCCXLVII. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MCCCXXXXVII, 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