638084925 has 48 divisors (see below), whose sum is σ = 1197185280. Its totient is φ = 333054720.

The previous prime is 638084893. The next prime is 638084959. The reversal of 638084925 is 529480836.

638084925 is a `hidden beast` number, since 638 + 0 + 8 + 4 + 9 + 2 + 5 = 666.

It is not a de Polignac number, because 638084925 - 2⁵ = 638084893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21669 + ... + 41781.

It is an arithmetic number, because the mean of its divisors is an integer number (24941360).

Almost surely, 2^638084925 is an apocalyptic number.

It is an amenable number.

638084925 is a deficient number, since it is larger than the sum of its proper divisors (559100355).

638084925 is a wasteful number, since it uses less digits than its factorization.

638084925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20179 (or 20168 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 638084925 is about 25260.3429311639. The cubic root of 638084925 is about 860.9134538899.

The spelling of 638084925 in words is "six hundred thirty-eight million, eighty-four thousand, nine hundred twenty-five".