634400418 has 16 divisors (see below), whose sum is σ = 1269699840. Its totient is φ = 211316976.

The previous prime is 634400413. The next prime is 634400453. The reversal of 634400418 is 814004436.

It is not an unprimeable number, because it can be changed into a prime (634400413) 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 7 ways as a sum of consecutive naturals, for example, 28105 + ... + 45372.

It is an arithmetic number, because the mean of its divisors is an integer number (79356240).

Almost surely, 2^634400418 is an apocalyptic number.

634400418 is an abundant number, since it is smaller than the sum of its proper divisors (635299422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634400418 is a wasteful number, since it uses less digits than its factorization.

634400418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74921.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 634400418 is about 25187.3066841217. The cubic root of 634400418 is about 859.2531906833.

The spelling of 634400418 in words is "six hundred thirty-four million, four hundred thousand, four hundred eighteen".