638932 has 24 divisors (see below), whose sum is σ = 1346240. Its totient is φ = 259200.

The previous prime is 638923. The next prime is 638933. The reversal of 638932 is 239836.

It is a happy number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 638894 and 638903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69 + ... + 1132.

2⁶³⁸⁹³² is an apocalyptic number.

It is an amenable number.

638932 is an abundant number, since it is smaller than the sum of its proper divisors (707308).

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

638932 is a wasteful number, since it uses less digits than its factorization.

638932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231 (or 1229 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 638932 is about 799.3322212948. The cubic root of 638932 is about 86.1294247402.

The spelling of 638932 in words is "six hundred thirty-eight thousand, nine hundred thirty-two".