639892 has 12 divisors (see below), whose sum is σ = 1221696. Its totient is φ = 290840.

The previous prime is 639857. The next prime is 639907. The reversal of 639892 is 298936.

It is a congruent number.

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, 7228 + ... + 7315.

It is an arithmetic number, because the mean of its divisors is an integer number (101808).

2⁶³⁹⁸⁹² is an apocalyptic number.

It is an amenable number.

639892 is a deficient number, since it is larger than the sum of its proper divisors (581804).

639892 is a wasteful number, since it uses less digits than its factorization.

639892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14558 (or 14556 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 639892 is about 799.9324971521. The cubic root of 639892 is about 86.1725398505.

The spelling of 639892 in words is "six hundred thirty-nine thousand, eight hundred ninety-two".