12991920 has 40 divisors (see below), whose sum is σ = 40275696. Its totient is φ = 3464448.

The previous prime is 12991879. The next prime is 12991931. The reversal of 12991920 is 2919921.

12991920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26827 + ... + 27306.

Almost surely, 2^12991920 is an apocalyptic number.

12991920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12991920 is an abundant number, since it is smaller than the sum of its proper divisors (27283776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12991920 is a wasteful number, since it uses less digits than its factorization.

12991920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54149 (or 54143 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 12991920 is about 3604.4306069059. The cubic root of 12991920 is about 235.0847438444.

The spelling of 12991920 in words is "twelve million, nine hundred ninety-one thousand, nine hundred twenty".