12989656 has 8 divisors (see below), whose sum is σ = 24355620. Its totient is φ = 6494824.

The previous prime is 12989653. The next prime is 12989657. The reversal of 12989656 is 65698921.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12989653) by changing a digit.

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, 811846 + ... + 811861.

Almost surely, 2^12989656 is an apocalyptic number.

It is an amenable number.

12989656 is a deficient number, since it is larger than the sum of its proper divisors (11365964).

12989656 is a wasteful number, since it uses less digits than its factorization.

12989656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623713 (or 1623709 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 12989656 is about 3604.1165352968. The cubic root of 12989656 is about 235.0710875929.

The spelling of 12989656 in words is "twelve million, nine hundred eighty-nine thousand, six hundred fifty-six".