638332 has 12 divisors (see below), whose sum is σ = 1138536. Its totient is φ = 313040.

The previous prime is 638327. The next prime is 638347. The reversal of 638332 is 233836.

It is a junction number, because it is equal to n+sod(n) for n = 638297 and 638306.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1294 + ... + 1717.

It is an arithmetic number, because the mean of its divisors is an integer number (94878).

2⁶³⁸³³² is an apocalyptic number.

It is an amenable number.

638332 is a deficient number, since it is larger than the sum of its proper divisors (500204).

638332 is a wasteful number, since it uses less digits than its factorization.

638332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068 (or 3066 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 638332 is about 798.9568198595. The cubic root of 638332 is about 86.1024558611.

Subtracting from 638332 its reverse (233836), we obtain a square (404496 = 636²).

The spelling of 638332 in words is "six hundred thirty-eight thousand, three hundred thirty-two".