638598 has 8 divisors (see below), whose sum is σ = 1277208. Its totient is φ = 212864.

The previous prime is 638587. The next prime is 638621. The reversal of 638598 is 895836.

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

638598 is an admirable number.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

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, 53211 + ... + 53222.

It is an arithmetic number, because the mean of its divisors is an integer number (159651).

2⁶³⁸⁵⁹⁸ is an apocalyptic number.

638598 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.

638598 is a wasteful number, since it uses less digits than its factorization.

638598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106438.

The product of its digits is 51840, while the sum is 39.

The square root of 638598 is about 799.1232695899. The cubic root of 638598 is about 86.1144141486.

The spelling of 638598 in words is "six hundred thirty-eight thousand, five hundred ninety-eight".