1929
1929 is the year of the Wall Street Crash that opened the Great Depression.
- Odd
- Composite
Where 1929 fits
Why 1929 is special
The crash itself took place over days in October, but the depression that followed was not caused by it alone — banking failures, monetary policy and trade contraction all compounded it. The year is a marker for the start of the slump rather than a full explanation of it.
1929 is part of
Factors & digit properties
- Divisors (4)
- 1, 3, 643, 1929
- Prime factorisation
- 3 × 643
- Digit sum
- 21
- Digital root
- 3
Representations
- Decimal
- 1929
- Binary
- 11110001001
- Octal
- 3611
- Hexadecimal
- 789
- Roman numeral
- MCMXXIX
- Scientific notation
- 1.929 × 10^3
Other mathematical patterns
- Deficient number
- Happy number
- Semiprime
Related numbers & connections
The two financial crises most often compared. The comparison is used mainly to argue about what policy did differently the second time, rather than to claim the causes were the same.
View 2008 →The 2010 flash crash removed a trillion dollars in minutes and recovered within the hour; the 1929 crash opened a decade-long depression. Speed and consequence are unrelated.
View 2010 →Finance & economics
The Wall Street Crash took place over several days in October 1929, but the depression that followed had more causes than the crash: bank failures, monetary contraction and collapsing trade all compounded it. Treating 1929 as the explanation rather than the starting marker is the common error.
DocumentedFinance & economicsGeography: United StatesPeriod: 1929
Common questions
Is 1929 a prime number?
No, 1929 is not prime.
What are the factors of 1929?
The factors of 1929 are 1, 3, 643, 1929.
What is 1929 in Roman numerals?
1929 in Roman numerals is MCMXXIX.
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