199939659 has 16 divisors (see below), whose sum is σ = 277324320. Its totient is φ = 127975680.

The previous prime is 199939651. The next prime is 199939687. The reversal of 199939659 is 956939991.

It is not a de Polignac number, because 199939659 - 2³ = 199939651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199939651) 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 15 ways as a sum of consecutive naturals, for example, 9399 + ... + 22095.

It is an arithmetic number, because the mean of its divisors is an integer number (17332770).

Almost surely, 2^199939659 is an apocalyptic number.

199939659 is a deficient number, since it is larger than the sum of its proper divisors (77384661).

199939659 is a wasteful number, since it uses less digits than its factorization.

199939659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12910.

The product of its digits is 5314410, while the sum is 60.

The square root of 199939659 is about 14140.0020862799. The cubic root of 199939659 is about 584.7447290088.

The spelling of 199939659 in words is "one hundred ninety-nine million, nine hundred thirty-nine thousand, six hundred fifty-nine".