199999923 has 8 divisors (see below), whose sum is σ = 272868288. Its totient is φ = 130232424.

The previous prime is 199999903. The next prime is 199999931. The reversal of 199999923 is 329999991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199999923 - 2¹³ = 199991731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199999903) 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 7 ways as a sum of consecutive naturals, for example, 775065 + ... + 775322.

It is an arithmetic number, because the mean of its divisors is an integer number (34108536).

Almost surely, 2^199999923 is an apocalyptic number.

199999923 is a deficient number, since it is larger than the sum of its proper divisors (72868365).

199999923 is a wasteful number, since it uses less digits than its factorization.

199999923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550433.

The product of its digits is 3188646, while the sum is 60.

The square root of 199999923 is about 14142.1329013696. The cubic root of 199999923 is about 584.8034725928.

The spelling of 199999923 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-three".