Subtracting from 273 its product of digits (42), we obtain a triangular number (231 = T21).
Subtracting 273 from its reverse (372), we obtain a palindrome (99).
273 is nontrivially palindromic in base 2, base 4, base 9 and base 16.
273 is an esthetic number in base 3 and base 4, because in such bases its adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
273 is an idoneal number.
It is an Ulam number.
It is the 17-th Hogben number.
273 is an undulating number in base 3 and base 4.
It is a Curzon number.
273 is a lucky number.
273 is a nontrivial repdigit in base 9 and base 16.
It is a plaindrome in base 6, base 9, base 11, base 14, base 15 and base 16.
It is a nialpdrome in base 7, base 8, base 9 and base 16.
It is a zygodrome in base 6, base 9 and base 16.
It is an amenable number.
273 is a wasteful number, since it uses less digits than its factorization.
273 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 23.
The square root of 273 is about 16.5227116419. The cubic root of 273 is about 6.4871541167.