638502 has 8 divisors (see below), whose sum is σ = 1277016. Its totient is φ = 212832.

The previous prime is 638501. The next prime is 638527. The reversal of 638502 is 205836.

It is a sphenic number, since it is the product of 3 distinct primes.

638502 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53203 + ... + 53214.

It is an arithmetic number, because the mean of its divisors is an integer number (159627).

2⁶³⁸⁵⁰² is an apocalyptic number.

638502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638502 is a wasteful number, since it uses less digits than its factorization.

638502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106422.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 638502 is about 799.0632015054. The cubic root of 638502 is about 86.1100987587.

The spelling of 638502 in words is "six hundred thirty-eight thousand, five hundred two".