12991892 has 6 divisors (see below), whose sum is σ = 22735818. Its totient is φ = 6495944.

The previous prime is 12991879. The next prime is 12991931. The reversal of 12991892 is 29819921.

12991892 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., 12859396 + 132496 = 3586^2 + 364^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1623983 + ... + 1623990.

It is an arithmetic number, because the mean of its divisors is an integer number (3789303).

Almost surely, 2^12991892 is an apocalyptic number.

It is an amenable number.

12991892 is a deficient number, since it is larger than the sum of its proper divisors (9743926).

12991892 is a wasteful number, since it uses less digits than its factorization.

12991892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247977 (or 3247975 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 12991892 is about 3604.4267227952. The cubic root of 12991892 is about 235.0845749605.

The spelling of 12991892 in words is "twelve million, nine hundred ninety-one thousand, eight hundred ninety-two".