639204 has 12 divisors (see below), whose sum is σ = 1491504. Its totient is φ = 213064.

The previous prime is 639181. The next prime is 639211. The reversal of 639204 is 402936.

It is a tau number, because it is divible by the number of its divisors (12).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26622 + ... + 26645.

It is an arithmetic number, because the mean of its divisors is an integer number (124292).

2⁶³⁹²⁰⁴ is an apocalyptic number.

It is an amenable number.

639204 is an abundant number, since it is smaller than the sum of its proper divisors (852300).

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

639204 is a wasteful number, since it uses less digits than its factorization.

639204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53274 (or 53272 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 639204 is about 799.5023452123. The cubic root of 639204 is about 86.1416450703.

The spelling of 639204 in words is "six hundred thirty-nine thousand, two hundred four".