199989239 has 2 divisors, whose sum is σ = 199989240. Its totient is φ = 199989238.

The previous prime is 199989221. The next prime is 199989263. The reversal of 199989239 is 932989991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199989239 - 2⁸ = 199988983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199289239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99994619 + 99994620.

It is an arithmetic number, because the mean of its divisors is an integer number (99994620).

Almost surely, 2^199989239 is an apocalyptic number.

199989239 is a deficient number, since it is larger than the sum of its proper divisors (1).

199989239 is an equidigital number, since it uses as much as digits as its factorization.

199989239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2834352, while the sum is 59.

The square root of 199989239 is about 14141.7551598095. The cubic root of 199989239 is about 584.7930590028.

The spelling of 199989239 in words is "one hundred ninety-nine million, nine hundred eighty-nine thousand, two hundred thirty-nine".