1409
1409 is the year the Council of Pisa elected a third pope.
- Odd
- Prime
Where 1409 fits
Why 1409 is special
Convened to end a schism between two claimants, it deposed both and elected a third — neither of the existing popes accepted the ruling, so there were then three.
Same number, different meanings
How 1409 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Convened to end a schism between two claimants, it deposed both and elected a third — neither of the existing popes accepted the ruling, so there were then three.
- History
In 1409, the Council of Pisa elected a third pope instead of resolving the schism (Europe).
- Religion & belief
Pisa in 1409 attempted to resolve a two-pope schism and produced a third claimant, because neither incumbent recognised its authority. Constance resolved it eight years later by removing all three.
1409 is part of
Factors & digit properties
- Divisors (2)
- 1, 1409
- Prime factorisation
- 1409
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 1409
- Scientific notation
- 1.409 × 10^3
Roman numerals
M C D I X
MCDIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 0 1 1 0 0 0 0 0 0 1
1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,409
Octal
2 6 0 1
2 × 512 + 6 × 64 + 0 × 8 + 1 × 1 = 1,409
Hexadecimal
5 8 1
5 × 256 + 8 × 16 + 1 × 1 = 1,409
Read as powers of two: 1,024 + 256 + 128 + 1 = 1,409.
In historical numeral systems
Egyptian
1 lotus, 4 coils of rope, 9 strokes
1 × 1,000 + 4 × 100 + 9 × 1 = 1,409. 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), 2 corner wedges + 9 vertical wedges (units place)
23 × 60 + 29 = 1409. 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
- Sophie Germain prime
Related numbers & connections
1409 is a year in the 15th century, in the 1400s.
The Western Schism began in 1378 with two claimants; the Council of Pisa in 1409 tried to resolve it and produced a third.
View 1378 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- developed from1378
why?
Strength 0.50, confidence "high".
History
In 1409, the Council of Pisa elected a third pope instead of resolving the schism (Europe).
DocumentedHistoryGeography: EuropePeriod: 1409
Religion & belief
Pisa in 1409 attempted to resolve a two-pope schism and produced a third claimant, because neither incumbent recognised its authority. Constance resolved it eight years later by removing all three.
DocumentedReligion & beliefGeography: PisaPeriod: 1409
Common questions
Is 1409 a prime number?
Yes, 1409 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1409?
The factors of 1409 are 1, 1409.
What is 1409 in Roman numerals?
1409 in Roman numerals is MCDIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MCCCCVIIII, 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