12643634 has 16 divisors (see below), whose sum is σ = 19662720. Its totient is φ = 6093360.

The previous prime is 12643619. The next prime is 12643643. The reversal of 12643634 is 43634621.

It is a super-2 number, since 2×12643634² = 319722961451912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12643597 and 12643606.

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 in 7 ways as a sum of consecutive naturals, for example, 5864 + ... + 7724.

It is an arithmetic number, because the mean of its divisors is an integer number (1228920).

Almost surely, 2^12643634 is an apocalyptic number.

12643634 is a deficient number, since it is larger than the sum of its proper divisors (7019086).

12643634 is a wasteful number, since it uses less digits than its factorization.

12643634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985.

The product of its digits is 10368, while the sum is 29.

The square root of 12643634 is about 3555.7888013773. The cubic root of 12643634 is about 232.9649784346.

The spelling of 12643634 in words is "twelve million, six hundred forty-three thousand, six hundred thirty-four".