199939589 has 2 divisors, whose sum is σ = 199939590. Its totient is φ = 199939588.

The previous prime is 199939561. The next prime is 199939631. The reversal of 199939589 is 985939991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183819364 + 16120225 = 13558^2 + 4015^2 .

It is a cyclic number.

It is not a de Polignac number, because 199939589 - 2²⁰ = 198891013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199939559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99969794 + 99969795.

It is an arithmetic number, because the mean of its divisors is an integer number (99969795).

Almost surely, 2^199939589 is an apocalyptic number.

It is an amenable number.

199939589 is a deficient number, since it is larger than the sum of its proper divisors (1).

199939589 is an equidigital number, since it uses as much as digits as its factorization.

199939589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7085880, while the sum is 62.

The square root of 199939589 is about 14139.9996110325. Note that the first 3 decimals coincide. The cubic root of 199939589 is about 584.7446607680.

The spelling of 199939589 in words is "one hundred ninety-nine million, nine hundred thirty-nine thousand, five hundred eighty-nine".