638425874 has 8 divisors (see below), whose sum is σ = 969176880. Its totient is φ = 315366916.

The previous prime is 638425867. The next prime is 638425877. The reversal of 638425874 is 478524836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (638425877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1922804 + ... + 1923135.

It is an arithmetic number, because the mean of its divisors is an integer number (121147110).

Almost surely, 2^638425874 is an apocalyptic number.

638425874 is a deficient number, since it is larger than the sum of its proper divisors (330751006).

638425874 is a wasteful number, since it uses less digits than its factorization.

638425874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846024.

The product of its digits is 1290240, while the sum is 47.

The square root of 638425874 is about 25267.0907308301. The cubic root of 638425874 is about 861.0667643688.

The spelling of 638425874 in words is "six hundred thirty-eight million, four hundred twenty-five thousand, eight hundred seventy-four".