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
- Binary
- 10110010101
- Octal
- 2625
- Hexadecimal
- 595
- Roman numeral
- MCDXXIX
- Scientific notation
- 1.429 × 10^3
Other mathematical patterns
- Deficient number
- Twin prime
History
Orléans 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.
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: 3 August 2026