199909933 has 4 divisors (see below), whose sum is σ = 200145148. Its totient is φ = 199674720.

The previous prime is 199909921. The next prime is 199909937. The reversal of 199909933 is 339909991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 339909991 = 103 ⋅3300097.

It can be written as a sum of positive squares in 2 ways, for example, as 74425129 + 125484804 = 8627^2 + 11202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199909933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199909937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116328 + ... + 118033.

It is an arithmetic number, because the mean of its divisors is an integer number (50036287).

Almost surely, 2^199909933 is an apocalyptic number.

It is an amenable number.

199909933 is a deficient number, since it is larger than the sum of its proper divisors (235215).

199909933 is an equidigital number, since it uses as much as digits as its factorization.

199909933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235214.

The product of its (nonzero) digits is 531441, while the sum is 52.

The square root of 199909933 is about 14138.9509158212. The cubic root of 199909933 is about 584.7157486264.

The spelling of 199909933 in words is "one hundred ninety-nine million, nine hundred nine thousand, nine hundred thirty-three".