634239818 has 4 divisors (see below), whose sum is σ = 951359730. Its totient is φ = 317119908.

The previous prime is 634239811. The next prime is 634239821. The reversal of 634239818 is 818932436.

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

It can be written as a sum of positive squares in only one way, i.e., 494929009 + 139310809 = 22247^2 + 11803^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (634239811) 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 as a sum of consecutive naturals, namely, 158559953 + ... + 158559956.

Almost surely, 2^634239818 is an apocalyptic number.

634239818 is a deficient number, since it is larger than the sum of its proper divisors (317119912).

634239818 is a wasteful number, since it uses less digits than its factorization.

634239818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317119911.

The product of its digits is 248832, while the sum is 44.

The square root of 634239818 is about 25184.1183685274. The cubic root of 634239818 is about 859.1806772230.

The spelling of 634239818 in words is "six hundred thirty-four million, two hundred thirty-nine thousand, eight hundred eighteen".