• 456 can be written using four 4's:
456 is nontrivially palindromic in base 7.
456 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is an Ulam number.
It is an alternating number because its digits alternate between even and odd.
It is a straight-line number, since its digits are in arithmetic progression.
It is a plaindrome in base 9, base 10 and base 14.
It is a nialpdrome in base 5, base 8 and base 12.
It is a zygodrome in base 5.
It is an upside-down number.
456 is the 14-th centered pentagonal number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
456 is a wasteful number, since it uses less digits than its factorization.
456 is an evil number, because the sum of its binary digits is even.
The square root of 456 is about 21.3541565041. The cubic root of 456 is about 7.6970022626.
Subtracting from 456 its sum of digits (15), we obtain a square (441 = 212).
Adding to 456 its product of digits (120), we get a square (576 = 242).
The spelling of 456 in words is "four hundred fifty-six", and thus it is an aban number.