199023809 has 4 divisors (see below), whose sum is σ = 199137216. Its totient is φ = 198910404.

The previous prime is 199023793. The next prime is 199023817. The reversal of 199023809 is 908320991.

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.

It is a cyclic number.

It is not a de Polignac number, because 199023809 - 2⁴ = 199023793 is a prime.

It is a super-2 number, since 2×199023809² = 79220953097736962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199025809) 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, 54029 + ... + 57594.

It is an arithmetic number, because the mean of its divisors is an integer number (49784304).

Almost surely, 2^199023809 is an apocalyptic number.

It is an amenable number.

199023809 is a deficient number, since it is larger than the sum of its proper divisors (113407).

199023809 is a wasteful number, since it uses less digits than its factorization.

199023809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113406.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 199023809 is about 14107.5798420565. The cubic root of 199023809 is about 583.8505288093.

The spelling of 199023809 in words is "one hundred ninety-nine million, twenty-three thousand, eight hundred nine".