12639642 has 16 divisors (see below), whose sum is σ = 25325472. Its totient is φ = 4205520.

The previous prime is 12639637. The next prime is 12639659. The reversal of 12639642 is 24693621.

12639642 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2373 + ... + 5559.

It is an arithmetic number, because the mean of its divisors is an integer number (1582842).

Almost surely, 2^12639642 is an apocalyptic number.

12639642 is an abundant number, since it is smaller than the sum of its proper divisors (12685830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12639642 is a wasteful number, since it uses less digits than its factorization.

12639642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3853.

The product of its digits is 15552, while the sum is 33.

The square root of 12639642 is about 3555.2274188862. The cubic root of 12639642 is about 232.9404576867.

The spelling of 12639642 in words is "twelve million, six hundred thirty-nine thousand, six hundred forty-two".