199890239 has 2 divisors, whose sum is σ = 199890240. Its totient is φ = 199890238.

The previous prime is 199890227. The next prime is 199890277. The reversal of 199890239 is 932098991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199890239 - 2⁸ = 199889983 is a prime.

It is a super-2 number, since 2×199890239² = 79912215294954242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199890209) 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 as a sum of consecutive naturals, namely, 99945119 + 99945120.

It is an arithmetic number, because the mean of its divisors is an integer number (99945120).

Almost surely, 2^199890239 is an apocalyptic number.

199890239 is a deficient number, since it is larger than the sum of its proper divisors (1).

199890239 is an equidigital number, since it uses as much as digits as its factorization.

199890239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 199890239 is about 14138.2544537860. The cubic root of 199890239 is about 584.6965470290.

The spelling of 199890239 in words is "one hundred ninety-nine million, eight hundred ninety thousand, two hundred thirty-nine".