1429
1429 is the year Joan of Arc relieved the siege of Orléans.
- Odd
- Prime
Where 1429 fits
Why 1429 is special
She was seventeen and had no military training. The siege lifted in nine days after months of stalemate, and the reversal is what made the rest of her story possible.
1429 is part of
Factors & digit properties
- Divisors (2)
- 1, 1429
- Prime factorisation
- 1429
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 1429
- Scientific notation
- 1.429 × 10^3
Roman numerals
M C D X X I X
MCDXXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 0 1 1 0 0 1 0 1 0 1
1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 1,429
Octal
2 6 2 5
2 × 512 + 6 × 64 + 2 × 8 + 5 × 1 = 1,429
Hexadecimal
5 9 5
5 × 256 + 9 × 16 + 5 × 1 = 1,429
Read as powers of two: 1,024 + 256 + 128 + 16 + 4 + 1 = 1,429.
In historical numeral systems
Egyptian
1 lotus, 4 coils of rope, 2 hobbles, 9 strokes
1 × 1,000 + 4 × 100 + 2 × 10 + 9 × 1 = 1,429. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 3 vertical wedges (sixties place), 4 corner wedges + 9 vertical wedges (units place)
23 × 60 + 49 = 1429. 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
- Twin prime
Related numbers & connections
1429 is a year in the 15th century, in the 1420s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1429, Joan of Arc relieved the siege of Orleans, turning the Hundred Years' War (France).
DocumentedHistoryGeography: FrancePeriod: 1429Orléans had been besieged for over six months when Joan of Arc arrived; it was relieved within nine days. Historians differ on how much was her doing and how much a change in French command and morale that she catalysed.
DocumentedHistoryGeography: FrancePeriod: 1429
Common questions
Is 1429 a prime number?
Yes, 1429 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1429?
The factors of 1429 are 1, 1429.
What is 1429 in Roman numerals?
1429 in Roman numerals is MCDXXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MCCCCXXVIIII, 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