12639042 has 24 divisors (see below), whose sum is σ = 29491644. Its totient is φ = 3888864.

The previous prime is 12639031. The next prime is 12639071. The reversal of 12639042 is 24093621.

It can be written as a sum of positive squares in 2 ways, for example, as 10361961 + 2277081 = 3219^2 + 1509^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12638997 and 12639015.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26773 + ... + 27240.

Almost surely, 2^12639042 is an apocalyptic number.

12639042 is an abundant number, since it is smaller than the sum of its proper divisors (16852602).

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

12639042 is a wasteful number, since it uses less digits than its factorization.

12639042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54034 (or 54031 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 12639042 is about 3555.1430350972. The cubic root of 12639042 is about 232.9367717572.

The spelling of 12639042 in words is "twelve million, six hundred thirty-nine thousand, forty-two".