199999138 has 16 divisors (see below), whose sum is σ = 310700160. Its totient is φ = 96440400.

The previous prime is 199999133. The next prime is 199999183. The reversal of 199999138 is 831999991.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is not an unprimeable number, because it can be changed into a prime (199999133) 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, 73543 + ... + 76213.

It is an arithmetic number, because the mean of its divisors is an integer number (19418760).

Almost surely, 2^199999138 is an apocalyptic number.

199999138 is a deficient number, since it is larger than the sum of its proper divisors (110701022).

199999138 is a wasteful number, since it uses less digits than its factorization.

199999138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993.

The product of its digits is 1417176, while the sum is 58.

The square root of 199999138 is about 14142.1051473958. The cubic root of 199999138 is about 584.8027074736.

The spelling of 199999138 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, one hundred thirty-eight".