638654425 has 12 divisors (see below), whose sum is σ = 798171136. Its totient is φ = 506898000.

The previous prime is 638654413. The next prime is 638654437. The reversal of 638654425 is 524456836.

It is an interprime number because it is at equal distance from previous prime (638654413) and next prime (638654437).

It is not a de Polignac number, because 638654425 - 2⁹ = 638653913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97401 + ... + 103750.

Almost surely, 2^638654425 is an apocalyptic number.

It is an amenable number.

638654425 is a deficient number, since it is larger than the sum of its proper divisors (159516711).

638654425 is a wasteful number, since it uses less digits than its factorization.

638654425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201288 (or 201283 counting only the distinct ones).

The product of its digits is 691200, while the sum is 43.

The square root of 638654425 is about 25271.6130272684. The cubic root of 638654425 is about 861.1695036211.

The spelling of 638654425 in words is "six hundred thirty-eight million, six hundred fifty-four thousand, four hundred twenty-five".