638850 has 24 divisors (see below), whose sum is σ = 1584720. Its totient is φ = 170320.

The previous prime is 638839. The next prime is 638857. The reversal of 638850 is 58836.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (638857) 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 11 ways as a sum of consecutive naturals, for example, 1980 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (66030).

2⁶³⁸⁸⁵⁰ is an apocalyptic number.

638850 is an abundant number, since it is smaller than the sum of its proper divisors (945870).

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

638850 is a wasteful number, since it uses less digits than its factorization.

638850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4274 (or 4269 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 638850 is about 799.2809268336. The cubic root of 638850 is about 86.1257399897.

The spelling of 638850 in words is "six hundred thirty-eight thousand, eight hundred fifty".