199999899 has 48 divisors (see below), whose sum is σ = 328333824. Its totient is φ = 116251200.

The previous prime is 199999889. The next prime is 199999901. The reversal of 199999899 is 998999991.

It is a happy number.

It is not a de Polignac number, because 199999899 - 2¹¹ = 199997851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199999819) 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 47 ways as a sum of consecutive naturals, for example, 246204 + ... + 247014.

It is an arithmetic number, because the mean of its divisors is an integer number (6840288).

Almost surely, 2^199999899 is an apocalyptic number.

199999899 is a deficient number, since it is larger than the sum of its proper divisors (128333925).

199999899 is a wasteful number, since it uses less digits than its factorization.

199999899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 925 counting only the distinct ones).

The product of its digits is 38263752, while the sum is 72.

The square root of 199999899 is about 14142.1320528413. The cubic root of 199999899 is about 584.8034492006.

The spelling of 199999899 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-nine".