297
A4 paper is 297 mm tall.
- Odd
- Composite
Where 297 fits
Why 297 is special
297 divided by 210 is very close to the square root of two, which is what lets a sheet be halved indefinitely without changing its proportions. North America uses Letter size instead, which has no such property and is why international document templates so often break.
Same number, different meanings
How 297 is understood across different contexts — never implying one meaning because of another.
- Mathematics
297 divided by 210 is very close to the square root of two, which is what lets a sheet be halved indefinitely without changing its proportions. North America uses Letter size instead, which has no such property and is why international document templates so often break.
- Everyday life
297 divided by 210 is very nearly the square root of two, the only ratio that stays the same when a sheet is halved. North American Letter size has no such property, which is the practical reason international document templates so often break.
- Geography
+297 reaches Aruba, part of the Kingdom of the Netherlands but outside the EU, with its own parliament and the Aruban florin.
Factors & digit properties
- Divisors (8)
- 1, 3, 9, 11, 27, 33, 99, 297
- Prime factorisation
- 3^3 × 11
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 297
- Binary
- 100101001
- Octal
- 451
- Hexadecimal
- 129
- Roman numeral
- CCXCVII
- Scientific notation
- 2.970 × 10^2
Other mathematical patterns
- Deficient number
- Kaprekar number
- Lucky number (mathematical sieve)
Related numbers & connections
A3 is 297 by 420 mm, an A4 sheet doubled along its short side. Each step up the series doubles the area and preserves the shape.
View 420 →Curaçao and Aruba are both constituent parts of the Kingdom of the Netherlands with their own governments, and both sit outside the European Union.
View 599 →Everyday life
297 divided by 210 is very nearly the square root of two, the only ratio that stays the same when a sheet is halved. North American Letter size has no such property, which is the practical reason international document templates so often break.
DocumentedEveryday life
Geography
+297 reaches Aruba, part of the Kingdom of the Netherlands but outside the EU, with its own parliament and the Aruban florin.
DocumentedGeographyGeography: Aruba
Common questions
Is 297 a prime number?
No, 297 is not prime.
What are the factors of 297?
The factors of 297 are 1, 3, 9, 11, 27, 33, 99, 297.
What is 297 in Roman numerals?
297 in Roman numerals is CCXCVII.
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