273 (number)

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273 (two hundred [and] seventy-three) is the natural number following 272 and preceding 274.

Contents

← 272 273 274 →
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

References

  1. ↑ Sloane, N. J. A. (ed.). "SequenceA007304(Sphenic numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  2. ↑ Sloane, N. J. A. (ed.). "SequenceA000959(Lucky numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  3. ↑ Sloane, N. J. A. (ed.). "SequenceA051937(Truncated triangular pyramid numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  4. ↑ Sloane, N. J. A. (ed.). "SequenceA000926(Euler's idoneal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  5. ↑ Sloane, N. J. A. (ed.). "SequenceA001764(Catalan numbers of order 3)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  6. ↑ Sloane, N. J. A. (ed.). "SequenceA000695(Moser-de Bruijn sequence)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  7. ↑ Sloane, N. J. A. (ed.). "SequenceA002061(Central polygonal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  8. 1 2 "Kelvin temperature scale". National Weather Service Glossary. NOAA. Retrieved 2026-01-26.
  9. ↑ "Absolute Zero". Smithsonian Magazine. 15 November 2013. Retrieved 2026-01-26.
  10. ↑ "273 Atropos". JPL Small-Body Database. NASA.
  11. ↑ "NGC 273". Courtney Seligman.
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