634636138 has 8 divisors (see below), whose sum is σ = 1002057120. Its totient is φ = 300617100.

The previous prime is 634636133. The next prime is 634636169. The reversal of 634636138 is 831636436.

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

It is a self number, because there is not a number n which added to its sum of digits gives 634636138.

It is not an unprimeable number, because it can be changed into a prime (634636133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8350438 + ... + 8350513.

It is an arithmetic number, because the mean of its divisors is an integer number (125257140).

Almost surely, 2^634636138 is an apocalyptic number.

634636138 is a deficient number, since it is larger than the sum of its proper divisors (367420982).

634636138 is a wasteful number, since it uses less digits than its factorization.

634636138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16700972.

The product of its digits is 186624, while the sum is 40.

The square root of 634636138 is about 25191.9855906596. The cubic root of 634636138 is about 859.3595998615.

The spelling of 634636138 in words is "six hundred thirty-four million, six hundred thirty-six thousand, one hundred thirty-eight".