12639724 has 6 divisors (see below), whose sum is σ = 22119524. Its totient is φ = 6319860.

The previous prime is 12639713. The next prime is 12639791. The reversal of 12639724 is 42793621.

It is a self number, because there is not a number n which added to its sum of digits gives 12639724.

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 as a sum of consecutive naturals, namely, 1579962 + ... + 1579969.

Almost surely, 2^12639724 is an apocalyptic number.

It is an amenable number.

12639724 is a deficient number, since it is larger than the sum of its proper divisors (9479800).

12639724 is a wasteful number, since it uses less digits than its factorization.

12639724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159935 (or 3159933 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 12639724 is about 3555.2389511818. The cubic root of 12639724 is about 232.9409614213.

The spelling of 12639724 in words is "twelve million, six hundred thirty-nine thousand, seven hundred twenty-four".