638425367 has 4 divisors (see below), whose sum is σ = 638563200. Its totient is φ = 638287536.

The previous prime is 638425349. The next prime is 638425373. The reversal of 638425367 is 763524836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638425367 - 2⁶ = 638425303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638425387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61718 + ... + 71315.

It is an arithmetic number, because the mean of its divisors is an integer number (159640800).

Almost surely, 2^638425367 is an apocalyptic number.

638425367 is a deficient number, since it is larger than the sum of its proper divisors (137833).

638425367 is a wasteful number, since it uses less digits than its factorization.

638425367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137832.

The product of its digits is 725760, while the sum is 44.

The square root of 638425367 is about 25267.0806980150. The cubic root of 638425367 is about 861.0665364327.

The spelling of 638425367 in words is "six hundred thirty-eight million, four hundred twenty-five thousand, three hundred sixty-seven".