199138239 has 6 divisors (see below), whose sum is σ = 287644136. Its totient is φ = 132758820.

The previous prime is 199138217. The next prime is 199138267. The reversal of 199138239 is 932831991.

It is a happy number.

It is not a de Polignac number, because 199138239 - 2⁷ = 199138111 is a prime.

It is a super-2 number, since 2×199138239² = 79312076464042242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199138194 and 199138203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199138339) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11063227 + ... + 11063244.

Almost surely, 2^199138239 is an apocalyptic number.

199138239 is a deficient number, since it is larger than the sum of its proper divisors (88505897).

199138239 is a wasteful number, since it uses less digits than its factorization.

199138239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22126477 (or 22126474 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 199138239 is about 14111.6348804807. The cubic root of 199138239 is about 583.9624035580.

The spelling of 199138239 in words is "one hundred ninety-nine million, one hundred thirty-eight thousand, two hundred thirty-nine".