199109838 has 32 divisors (see below), whose sum is σ = 414351360. Its totient is φ = 63715680.

The previous prime is 199109809. The next prime is 199109843. The reversal of 199109838 is 838901991.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19408 + ... + 27836.

It is an arithmetic number, because the mean of its divisors is an integer number (12948480).

Almost surely, 2^199109838 is an apocalyptic number.

199109838 is an abundant number, since it is smaller than the sum of its proper divisors (215241522).

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

199109838 is a wasteful number, since it uses less digits than its factorization.

199109838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8592.

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 199109838 is about 14110.6285473043. The cubic root of 199109838 is about 583.9346407589.

The spelling of 199109838 in words is "one hundred ninety-nine million, one hundred nine thousand, eight hundred thirty-eight".