199139138 has 12 divisors (see below), whose sum is σ = 328333110. Its totient is φ = 90517680.

The previous prime is 199139131. The next prime is 199139147. The reversal of 199139138 is 831931991.

It can be written as a sum of positive squares in only one way, i.e., 135187129 + 63952009 = 11627^2 + 7997^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199139131) 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 5 ways as a sum of consecutive naturals, for example, 411203 + ... + 411686.

Almost surely, 2^199139138 is an apocalyptic number.

199139138 is a deficient number, since it is larger than the sum of its proper divisors (129193972).

199139138 is a wasteful number, since it uses less digits than its factorization.

199139138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822913 (or 822902 counting only the distinct ones).

The product of its digits is 52488, while the sum is 44.

The square root of 199139138 is about 14111.6667335932. Note that the first 3 decimals coincide. The cubic root of 199139138 is about 583.9632823134.

The spelling of 199139138 in words is "one hundred ninety-nine million, one hundred thirty-nine thousand, one hundred thirty-eight".