1040
Form 1040 is the US individual income tax return.
- Even
- Composite
Where 1040 fits
Why 1040 is special
It has been the main personal tax form since 1913, and its number is used in ordinary American speech as a synonym for filing taxes at all. The instructions run to over a hundred pages for a form of two.
Same number, different meanings
How 1040 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It has been the main personal tax form since 1913, and its number is used in ordinary American speech as a synonym for filing taxes at all. The instructions run to over a hundred pages for a form of two.
- Technology & computing
The Atari 1040ST included MIDI ports as standard, which no competitor did. It became widely used in music studios for sequencing, a role it held well past its commercial life.
- Finance & economics
Form 1040 has been the American personal income tax return since 1913, and the number stands in for the act of filing in ordinary speech. Its instructions run past a hundred pages for a form of two, which is itself a fact about the tax code.
Factors & digit properties
- Divisors (20)
- 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040
- Prime factorisation
- 2^4 × 5 × 13
- Digit sum
- 5
- Digital root
- 5
Representations
- Decimal
- 1040
- Binary
- 10000010000
- Octal
- 2020
- Hexadecimal
- 410
- Roman numeral
- MXL
- Scientific notation
- 1.040 × 10^3
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Related numbers & connections
Two US tax forms whose numbers are used as ordinary nouns — 1040 for filing at all, 1099 for being a contractor rather than an employee.
View 1099 →Numbers Around Us
- appears alongside1099
why?
Strength 0.50, confidence "high".
Technology & computing
The Atari 1040ST included MIDI ports as standard, which no competitor did. It became widely used in music studios for sequencing, a role it held well past its commercial life.
DocumentedTechnology & computingGeography: United States and EuropePeriod: 1986–
Finance & economics
Form 1040 has been the American personal income tax return since 1913, and the number stands in for the act of filing in ordinary speech. Its instructions run past a hundred pages for a form of two, which is itself a fact about the tax code.
DocumentedFinance & economicsGeography: United States
Common questions
Is 1040 a prime number?
No, 1040 is not prime.
What are the factors of 1040?
The factors of 1040 are 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040.
What is 1040 in Roman numerals?
1040 in Roman numerals is MXL.
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: 3 August 2026