12991912 has 8 divisors (see below), whose sum is σ = 24359850. Its totient is φ = 6495952.

The previous prime is 12991879. The next prime is 12991931. The reversal of 12991912 is 21919921.

12991912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12916836 + 75076 = 3594^2 + 274^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811987 + ... + 812002.

Almost surely, 2^12991912 is an apocalyptic number.

It is an amenable number.

12991912 is a deficient number, since it is larger than the sum of its proper divisors (11367938).

12991912 is a wasteful number, since it uses less digits than its factorization.

12991912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623995 (or 1623991 counting only the distinct ones).

The product of its digits is 2916, while the sum is 34.

The square root of 12991912 is about 3604.4294971604. The cubic root of 12991912 is about 235.0846955919.

The spelling of 12991912 in words is "twelve million, nine hundred ninety-one thousand, nine hundred twelve".