638004 has 24 divisors (see below), whose sum is σ = 1509760. Its totient is φ = 209664.

The previous prime is 637939. The next prime is 638023. The reversal of 638004 is 400836.

638004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

638004 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612 + ... + 1284.

2⁶³⁸⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

638004 is an abundant number, since it is smaller than the sum of its proper divisors (871756).

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

638004 is a wasteful number, since it uses less digits than its factorization.

638004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 638004 is about 798.7515258201. The cubic root of 638004 is about 86.0877057289.

The spelling of 638004 in words is "six hundred thirty-eight thousand, four".