12639718 has 32 divisors (see below), whose sum is σ = 23978304. Its totient is φ = 4862592.

The previous prime is 12639713. The next prime is 12639791. The reversal of 12639718 is 81793621.

It is a super-2 number, since 2×12639718² = 319524942239048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639713) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5796 + ... + 7672.

It is an arithmetic number, because the mean of its divisors is an integer number (749322).

Almost surely, 2^12639718 is an apocalyptic number.

12639718 is a deficient number, since it is larger than the sum of its proper divisors (11338586).

12639718 is a wasteful number, since it uses less digits than its factorization.

12639718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936.

The product of its digits is 18144, while the sum is 37.

The square root of 12639718 is about 3555.2381073565. The cubic root of 12639718 is about 232.9409245627.

The spelling of 12639718 in words is "twelve million, six hundred thirty-nine thousand, seven hundred eighteen".