634427018 has 4 divisors (see below), whose sum is σ = 951640530. Its totient is φ = 317213508.

The previous prime is 634426931. The next prime is 634427033. The reversal of 634427018 is 810724436.

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., 487217329 + 147209689 = 22073^2 + 12133^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 158606753 + ... + 158606756.

Almost surely, 2^634427018 is an apocalyptic number.

634427018 is a deficient number, since it is larger than the sum of its proper divisors (317213512).

634427018 is a wasteful number, since it uses less digits than its factorization.

634427018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317213511.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 634427018 is about 25187.8347223417. The cubic root of 634427018 is about 859.2651998260.

The spelling of 634427018 in words is "six hundred thirty-four million, four hundred twenty-seven thousand, eighteen".