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
[edit]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
[edit]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
[edit]- 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
[edit]- ^ 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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