273 (number)
273 (two hundred [and] seventy-three) is the natural number following 272 and preceding 274.
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|---|---|---|---|---|
| Cardinal | two hundred seventy-three | |||
| Ordinal | 273rd (two hundred seventy-third) | |||
| Factorization | 3 × 7 × 13 | |||
| Divisors | 1, 3, 7, 13, 21, 39, 91, 273 | |||
| Greek numeral | ΣΟΓ´ | |||
| Roman numeral | CCLXXIII, cclxxiii | |||
| Binary | 1000100012 | |||
| Ternary | 1010103 | |||
| Senary | 11336 | |||
| Octal | 4218 | |||
| Duodecimal | 1A912 | |||
| Hexadecimal | 11116 | |||
In mathematics
273 is a sphenic number, being the product of three distinct primes: 3 × 7 × 13.[1] It is also a lucky number,[2] a truncated triangular pyramid number,[3] and an idoneal number.[4]
There are 273 different ternary trees with five nodes.[5] It is in the Moser–de Bruijn sequence, comprising the sum 44 + 42 + 40 = 256 + 16 + 1,[6] and is a central polygonal number.[7]
273 is a deficient number, as the sum of its proper divisors (175) is less than itself.
In science
The number 273 has particular significance in temperature measurement. Absolute zero, the lowest possible temperature, is −273.15 °C (0.00 K; −459.67 °F), often rounded to −273 °C.[8] Correspondingly, the freezing point of water at standard pressure is approximately 273 K (273.15 K exactly).[8]
This relationship arises from Charles's law, which determined that at constant pressure, ideal gases expand or contract their volume by about 1⁄273 per degree Celsius of temperature change.[9]
In astronomy
- 273 Atropos is a main-belt asteroid discovered by Austrian astronomer Johann Palisa on 8 March 1888 in Vienna. It is named after Atropos, one of the Three Fates in Greek mythology.[10]
- NGC 273 is an edge-on lenticular galaxy in the constellation Cetus, discovered on 10 September 1785 by William Herschel.[11]
References
- ^ Sloane, N. J. A. (ed.). "Sequence A007304 (Sphenic numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A000959 (Lucky numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A051937 (Truncated triangular pyramid numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A000926 (Euler's idoneal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A001764 (Catalan numbers of order 3)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A000695 (Moser-de Bruijn sequence)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A002061 (Central polygonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ a b "Kelvin temperature scale". National Weather Service Glossary. NOAA. Retrieved 2026-01-26.
- ^ "Absolute Zero". Smithsonian Magazine. 15 November 2013. Retrieved 2026-01-26.
- ^ "273 Atropos". JPL Small-Body Database. NASA.
- ^ "NGC 273". Courtney Seligman.
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