634391984 has 20 divisors (see below), whose sum is σ = 1235575680. Its totient is φ = 315533760.

The previous prime is 634391983. The next prime is 634391987. The reversal of 634391984 is 489193436.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (634391981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100739 + ... + 106850.

It is an arithmetic number, because the mean of its divisors is an integer number (61778784).

Almost surely, 2^634391984 is an apocalyptic number.

It is an amenable number.

634391984 is a deficient number, since it is larger than the sum of its proper divisors (601183696).

634391984 is a wasteful number, since it uses less digits than its factorization.

634391984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207788 (or 207782 counting only the distinct ones).

The product of its digits is 559872, while the sum is 47.

The square root of 634391984 is about 25187.1392579626. The cubic root of 634391984 is about 859.2493829024.

The spelling of 634391984 in words is "six hundred thirty-four million, three hundred ninety-one thousand, nine hundred eighty-four".