199389638 has 8 divisors (see below), whose sum is σ = 341810832. Its totient is φ = 85452696.

The previous prime is 199389607. The next prime is 199389643. The reversal of 199389638 is 836983991.

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

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, 7121045 + ... + 7121072.

It is an arithmetic number, because the mean of its divisors is an integer number (42726354).

Almost surely, 2^199389638 is an apocalyptic number.

199389638 is a deficient number, since it is larger than the sum of its proper divisors (142421194).

199389638 is a wasteful number, since it uses less digits than its factorization.

199389638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14242126.

The product of its digits is 2519424, while the sum is 56.

The square root of 199389638 is about 14120.5395789254. The cubic root of 199389638 is about 584.2080383324.

The spelling of 199389638 in words is "one hundred ninety-nine million, three hundred eighty-nine thousand, six hundred thirty-eight".