12643976 has 16 divisors (see below), whose sum is σ = 23930640. Its totient is φ = 6262480.

The previous prime is 12643933. The next prime is 12643999. The reversal of 12643976 is 67934621.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6530 + ... + 8241.

It is an arithmetic number, because the mean of its divisors is an integer number (1495665).

Almost surely, 2^12643976 is an apocalyptic number.

It is an amenable number.

12643976 is a deficient number, since it is larger than the sum of its proper divisors (11286664).

12643976 is a wasteful number, since it uses less digits than its factorization.

12643976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14884 (or 14880 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 12643976 is about 3555.8368916473. The cubic root of 12643976 is about 232.9670789200.

The spelling of 12643976 in words is "twelve million, six hundred forty-three thousand, nine hundred seventy-six".