634638199 has 8 divisors (see below), whose sum is σ = 686058912. Its totient is φ = 583589280.

The previous prime is 634638197. The next prime is 634638223. The reversal of 634638199 is 991836436.

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

It is a cyclic number.

It is not a de Polignac number, because 634638199 - 2¹ = 634638197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634638197) 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, 89392 + ... + 96229.

It is an arithmetic number, because the mean of its divisors is an integer number (85757364).

Almost surely, 2^634638199 is an apocalyptic number.

634638199 is a deficient number, since it is larger than the sum of its proper divisors (51420713).

634638199 is a wasteful number, since it uses less digits than its factorization.

634638199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185897.

The product of its digits is 839808, while the sum is 49.

The square root of 634638199 is about 25192.0264964929. The cubic root of 634638199 is about 859.3605301259.

The spelling of 634638199 in words is "six hundred thirty-four million, six hundred thirty-eight thousand, one hundred ninety-nine".