639384 has 16 divisors (see below), whose sum is σ = 1598520. Its totient is φ = 213120.

The previous prime is 639371. The next prime is 639391. The reversal of 639384 is 483936.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639384.

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, 13297 + ... + 13344.

2⁶³⁹³⁸⁴ is an apocalyptic number.

It is an amenable number.

639384 is an abundant number, since it is smaller than the sum of its proper divisors (959136).

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

639384 is a wasteful number, since it uses less digits than its factorization.

639384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26650 (or 26646 counting only the distinct ones).

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

The square root of 639384 is about 799.6149073148. The cubic root of 639384 is about 86.1497301474.

The spelling of 639384 in words is "six hundred thirty-nine thousand, three hundred eighty-four".