639588 has 12 divisors (see below), whose sum is σ = 1492400. Its totient is φ = 213192.

The previous prime is 639577. The next prime is 639589. The reversal of 639588 is 885936.

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 639588.

It is not an unprimeable number, because it can be changed into a prime (639589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26638 + ... + 26661.

2⁶³⁹⁵⁸⁸ is an apocalyptic number.

It is an amenable number.

639588 is an abundant number, since it is smaller than the sum of its proper divisors (852812).

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

639588 is a wasteful number, since it uses less digits than its factorization.

639588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53306 (or 53304 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 639588 is about 799.7424585452. The cubic root of 639588 is about 86.1588914006.

The spelling of 639588 in words is "six hundred thirty-nine thousand, five hundred eighty-eight".