199999929 has 4 divisors (see below), whose sum is σ = 266666576. Its totient is φ = 133333284.

The previous prime is 199999903. The next prime is 199999931. The reversal of 199999929 is 929999991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 929999991 = 3 ⋅309999997.

It is not a de Polignac number, because 199999929 - 2⁸ = 199999673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199999929.

It is not an unprimeable number, because it can be changed into a prime (199999949) 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 3 ways as a sum of consecutive naturals, for example, 33333319 + ... + 33333324.

It is an arithmetic number, because the mean of its divisors is an integer number (66666644).

Almost surely, 2^199999929 is an apocalyptic number.

It is an amenable number.

199999929 is a deficient number, since it is larger than the sum of its proper divisors (66666647).

199999929 is an equidigital number, since it uses as much as digits as its factorization.

199999929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66666646.

The product of its digits is 9565938, while the sum is 66.

The square root of 199999929 is about 14142.1331135017. The cubic root of 199999929 is about 584.8034784408.

The spelling of 199999929 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-nine".