Subtracting from 3993 its sum of digits (24), we obtain a square (3969 = 632).
3993 is nontrivially palindromic in base 10.
It is an ABA number since it can be written as A⋅BA, here for A=3, B=11.
3993 is a Rhonda number in base 12.
It is a plaindrome in base 12.
It is a nialpdrome in base 8, base 11 and base 16.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3993.
23993 is an apocalyptic number.
3993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.
It is an amenable number.
3993 is an equidigital number, since it uses as much as digits as its factorization.
3993 is an evil number, because the sum of its binary digits is even.
The square root of 3993 is about 63.1901891119. The cubic root of 3993 is about 15.8647452734.
The spelling of 3993 in words is "three thousand, nine hundred ninety-three".