634703391 has 64 divisors (see below), whose sum is σ = 1099699200. Its totient is φ = 354336768.

The previous prime is 634703383. The next prime is 634703401. The reversal of 634703391 is 193307436.

It is not a de Polignac number, because 634703391 - 2³ = 634703383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634703491) 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 in 63 ways as a sum of consecutive naturals, for example, 2469535 + ... + 2469791.

It is an arithmetic number, because the mean of its divisors is an integer number (17182800).

Almost surely, 2^634703391 is an apocalyptic number.

634703391 is a deficient number, since it is larger than the sum of its proper divisors (464995809).

634703391 is a wasteful number, since it uses less digits than its factorization.

634703391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The square root of 634703391 is about 25193.3203647316. The cubic root of 634703391 is about 859.3899545096.

The spelling of 634703391 in words is "six hundred thirty-four million, seven hundred three thousand, three hundred ninety-one".