199999838 has 16 divisors (see below), whose sum is σ = 306065760. Its totient is φ = 97998336.

The previous prime is 199999831. The next prime is 199999841. The reversal of 199999838 is 838999991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999831) 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 7 ways as a sum of consecutive naturals, for example, 14978 + ... + 24986.

It is an arithmetic number, because the mean of its divisors is an integer number (19129110).

Almost surely, 2^199999838 is an apocalyptic number.

199999838 is a deficient number, since it is larger than the sum of its proper divisors (106065922).

199999838 is a wasteful number, since it uses less digits than its factorization.

199999838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10211.

The product of its digits is 11337408, while the sum is 65.

The square root of 199999838 is about 14142.1298961649. The cubic root of 199999838 is about 584.8033897456.

It can be divided in two parts, 19999983 and 8, that added together give a palindrome (19999991).

The spelling of 199999838 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred thirty-eight".