1090
UN 1090 is acetone.
- Even
- Composite
Where 1090 fits
Why 1090 is special
Its very low flash point is why a solvent sold openly in hardware shops is treated as a serious flammable liquid the moment it moves in bulk.
Same number, different meanings
How 1090 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Its very low flash point is why a solvent sold openly in hardware shops is treated as a serious flammable liquid the moment it moves in bulk.
- History
In 1090, Bernard of Clairvaux was born, and under him the Cistercian order grew from five houses to several hundred (France).
- Technology & computing
Aircraft transponders reply to secondary radar on 1090 MHz, and ADS-B broadcasts position on the same frequency. Public receivers tracking flights are listening to this band.
1090 is part of
Factors & digit properties
- Divisors (8)
- 1, 2, 5, 10, 109, 218, 545, 1090
- Prime factorisation
- 2 × 5 × 109
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 1090
- Scientific notation
- 1.090 × 10^3
Roman numerals
M X C
MXC uses the subtractive pair XC: ten before a hundred — a hundred minus ten.
Binary
1 0 0 0 1 0 0 0 0 1 0
1 × 1,024 + 0 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,090
Octal
2 1 0 2
2 × 512 + 1 × 64 + 0 × 8 + 2 × 1 = 1,090
Hexadecimal
4 4 2
4 × 256 + 4 × 16 + 2 × 1 = 1,090
Read as powers of two: 1,024 + 64 + 2 = 1,090.
In historical numeral systems
Egyptian
1 lotus, 9 hobbles
1 × 1,000 + 9 × 10 = 1,090. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 8 vertical wedges (sixties place), 1 corner wedge (units place)
18 × 60 + 10 = 1090. 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
- Happy number
- Harshad (Niven) number
Related numbers & connections
1090 is a year in the 11th century, in the 1090s.
History
In 1090, Bernard of Clairvaux was born, and under him the Cistercian order grew from five houses to several hundred (France).
DocumentedHistoryGeography: FrancePeriod: 1090
Technology & computing
Aircraft transponders reply to secondary radar on 1090 MHz, and ADS-B broadcasts position on the same frequency. Public receivers tracking flights are listening to this band.
DocumentedTechnology & computingGeography: International — ICAOPeriod: 1950s–UN 1090 identifies acetone as a flammable liquid with a flash point around minus 20 degrees Celsius. Small retail quantities are exempt from many requirements that apply in bulk.
DocumentedTechnology & computingGeography: International — UN model regulationsPeriod: 1956–
Common questions
Is 1090 a prime number?
No, 1090 is not prime.
What are the factors of 1090?
The factors of 1090 are 1, 2, 5, 10, 109, 218, 545, 1090.
What is 1090 in Roman numerals?
1090 in Roman numerals is MXC. XC is subtractive: ten before a hundred — a hundred minus ten. Written additively it would be MLXXXX, 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: 3 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026