639004 has 12 divisors (see below), whose sum is σ = 1129464. Its totient is φ = 316304.

The previous prime is 638999. The next prime is 639007. The reversal of 639004 is 400936.

It is a super-2 number, since 2×639004² = 816652224032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319 + ... + 1174.

It is an arithmetic number, because the mean of its divisors is an integer number (94122).

2⁶³⁹⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

639004 is a deficient number, since it is larger than the sum of its proper divisors (490460).

639004 is a wasteful number, since it uses less digits than its factorization.

639004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604 (or 1602 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 639004 is about 799.3772576200. The cubic root of 639004 is about 86.1326598709.

The spelling of 639004 in words is "six hundred thirty-nine thousand, four".