12643964 has 18 divisors (see below), whose sum is σ = 22545432. Its totient is φ = 6203400.

The previous prime is 12643933. The next prime is 12643999. The reversal of 12643964 is 46934621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59819 + ... + 60029.

It is an arithmetic number, because the mean of its divisors is an integer number (1252524).

Almost surely, 2^12643964 is an apocalyptic number.

It is an amenable number.

12643964 is a deficient number, since it is larger than the sum of its proper divisors (9901468).

12643964 is an equidigital number, since it uses as much as digits as its factorization.

12643964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 284 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 12643964 is about 3555.8352042804. The cubic root of 12643964 is about 232.9670052194.

The spelling of 12643964 in words is "twelve million, six hundred forty-three thousand, nine hundred sixty-four".