12656404 has 6 divisors (see below), whose sum is σ = 22148714. Its totient is φ = 6328200.

The previous prime is 12656387. The next prime is 12656419. The reversal of 12656404 is 40465621.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 1567504 = 3330^2 + 1252^2 .

It is a super-2 number, since 2×12656404² = 320369124422432, which contains 22 as substring.

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, 1582047 + ... + 1582054.

Almost surely, 2^12656404 is an apocalyptic number.

It is an amenable number.

12656404 is a deficient number, since it is larger than the sum of its proper divisors (9492310).

12656404 is a wasteful number, since it uses less digits than its factorization.

12656404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164105 (or 3164103 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 12656404 is about 3557.5840116573. The cubic root of 12656404 is about 233.0433831552.

The spelling of 12656404 in words is "twelve million, six hundred fifty-six thousand, four hundred four".