638875 has 16 divisors (see below), whose sum is σ = 842400. Its totient is φ = 482400.

The previous prime is 638861. The next prime is 638893. The reversal of 638875 is 578836.

It is not a de Polignac number, because 638875 - 2¹⁷ = 507803 is a prime.

It is a super-2 number, since 2×638875² = 816322531250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2241 + ... + 2509.

It is an arithmetic number, because the mean of its divisors is an integer number (52650).

2⁶³⁸⁸⁷⁵ is an apocalyptic number.

638875 is a deficient number, since it is larger than the sum of its proper divisors (203525).

638875 is a wasteful number, since it uses less digits than its factorization.

638875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 293 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 638875 is about 799.2965657376. The cubic root of 638875 is about 86.1268634226.

Adding to 638875 its product of digits (40320), we get a triangular number (679195 = T₁₁₆₅).

The spelling of 638875 in words is "six hundred thirty-eight thousand, eight hundred seventy-five".