638982 has 16 divisors (see below), whose sum is σ = 1420080. Its totient is φ = 212976.

The previous prime is 638977. The next prime is 638993. The reversal of 638982 is 289836.

It is a congruent number.

It is an unprimeable number.

638982 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 7 ways as a sum of consecutive naturals, for example, 5863 + ... + 5970.

It is an arithmetic number, because the mean of its divisors is an integer number (88755).

2⁶³⁸⁹⁸² is an apocalyptic number.

638982 is an abundant number, since it is smaller than the sum of its proper divisors (781098).

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

638982 is a wasteful number, since it uses less digits than its factorization.

638982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11844 (or 11838 counting only the distinct ones).

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

The square root of 638982 is about 799.3634967898. The cubic root of 638982 is about 86.1316713845.

It can be divided in two parts, 63 and 8982, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 638982 in words is "six hundred thirty-eight thousand, nine hundred eighty-two".