634398638 has 8 divisors (see below), whose sum is σ = 1001682120. Its totient is φ = 300504600.

The previous prime is 634398629. The next prime is 634398643. The reversal of 634398638 is 836893436.

634398638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×634398638³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8347313 + ... + 8347388.

It is an arithmetic number, because the mean of its divisors is an integer number (125210265).

Almost surely, 2^634398638 is an apocalyptic number.

634398638 is a deficient number, since it is larger than the sum of its proper divisors (367283482).

634398638 is a wasteful number, since it uses less digits than its factorization.

634398638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16694722.

The product of its digits is 2239488, while the sum is 50.

The square root of 634398638 is about 25187.2713488381. The cubic root of 634398638 is about 859.2523870520.

The spelling of 634398638 in words is "six hundred thirty-four million, three hundred ninety-eight thousand, six hundred thirty-eight".