199309923 has 8 divisors (see below), whose sum is σ = 295274000. Its totient is φ = 132873264.

The previous prime is 199309909. The next prime is 199309933. The reversal of 199309923 is 329903991.

It is not a de Polignac number, because 199309923 - 2¹⁶ = 199244387 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (199309933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3690898 + ... + 3690951.

It is an arithmetic number, because the mean of its divisors is an integer number (36909250).

Almost surely, 2^199309923 is an apocalyptic number.

199309923 is a deficient number, since it is larger than the sum of its proper divisors (95964077).

199309923 is an equidigital number, since it uses as much as digits as its factorization.

199309923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7381858 (or 7381852 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 199309923 is about 14117.7166354903. The cubic root of 199309923 is about 584.1301734514.

The spelling of 199309923 in words is "one hundred ninety-nine million, three hundred nine thousand, nine hundred twenty-three".