634393938 has 16 divisors (see below), whose sum is σ = 1272625056. Its totient is φ = 210825120.

The previous prime is 634393933. The next prime is 634393957. The reversal of 634393938 is 839393436.

It is a super-2 number, since 2×634393938² = 804911337142295688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (634393933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157731 + ... + 161702.

It is an arithmetic number, because the mean of its divisors is an integer number (79539066).

Almost surely, 2^634393938 is an apocalyptic number.

634393938 is an abundant number, since it is smaller than the sum of its proper divisors (638231118).

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

634393938 is a wasteful number, since it uses less digits than its factorization.

634393938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319769.

The product of its digits is 1259712, while the sum is 48.

The square root of 634393938 is about 25187.1780475702. The cubic root of 634393938 is about 859.2502650970.

The spelling of 634393938 in words is "six hundred thirty-four million, three hundred ninety-three thousand, nine hundred thirty-eight".