639882 has 24 divisors (see below), whose sum is σ = 1460160. Its totient is φ = 201960.

The previous prime is 639857. The next prime is 639907. The reversal of 639882 is 288936.

It is an interprime number because it is at equal distance from previous prime (639857) and next prime (639907).

It is an unprimeable number.

639882 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 11 ways as a sum of consecutive naturals, for example, 594 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (60840).

2⁶³⁹⁸⁸² is an apocalyptic number.

639882 is an abundant number, since it is smaller than the sum of its proper divisors (820278).

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

639882 is a wasteful number, since it uses less digits than its factorization.

639882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898 (or 1895 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 639882 is about 799.9262466003. The cubic root of 639882 is about 86.1720909571.

It can be divided in two parts, 639 and 882, that added together give a square (1521 = 39²).

The spelling of 639882 in words is "six hundred thirty-nine thousand, eight hundred eighty-two".