638835925 has 96 divisors (see below), whose sum is σ = 1054932480. Its totient is φ = 372556800.

The previous prime is 638835887. The next prime is 638835937. The reversal of 638835925 is 529538836.

It is not a de Polignac number, because 638835925 - 2²⁵ = 605281493 is a prime.

It is a super-2 number, since 2×638835925² = 816222678141211250, 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 95 ways as a sum of consecutive naturals, for example, 1517215 + ... + 1517635.

It is an arithmetic number, because the mean of its divisors is an integer number (10988880).

Almost surely, 2^638835925 is an apocalyptic number.

638835925 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

638835925 is a deficient number, since it is larger than the sum of its proper divisors (416096555).

638835925 is a wasteful number, since it uses less digits than its factorization.

638835925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 498 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 49.

The square root of 638835925 is about 25275.2037578335. The cubic root of 638835925 is about 861.2510748405.

The spelling of 638835925 in words is "six hundred thirty-eight million, eight hundred thirty-five thousand, nine hundred twenty-five".