12156556 has 6 divisors (see below), whose sum is σ = 21273980. Its totient is φ = 6078276.

The previous prime is 12156553. The next prime is 12156563. The reversal of 12156556 is 65565121.

It is a super-2 number, since 2×12156556² = 295563707562272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12156553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1519566 + ... + 1519573.

Almost surely, 2^12156556 is an apocalyptic number.

It is an amenable number.

12156556 is a deficient number, since it is larger than the sum of its proper divisors (9117424).

12156556 is a wasteful number, since it uses less digits than its factorization.

12156556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3039143 (or 3039141 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 12156556 is about 3486.6253024952. The cubic root of 12156556 is about 229.9341714571.

The spelling of 12156556 in words is "twelve million, one hundred fifty-six thousand, five hundred fifty-six".