12456656 has 10 divisors (see below), whose sum is σ = 24134802. Its totient is φ = 6228320.

The previous prime is 12456649. The next prime is 12456667. The reversal of 12456656 is 65665421.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 1032256 = 3380^2 + 1016^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389255 + ... + 389286.

Almost surely, 2^12456656 is an apocalyptic number.

12456656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12456656 is a deficient number, since it is larger than the sum of its proper divisors (11678146).

12456656 is an equidigital number, since it uses as much as digits as its factorization.

12456656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778549 (or 778543 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 12456656 is about 3529.3988156625. The cubic root of 12456656 is about 231.8108843298.

The spelling of 12456656 in words is "twelve million, four hundred fifty-six thousand, six hundred fifty-six".