199579923 has 16 divisors (see below), whose sum is σ = 302887200. Its totient is φ = 129807360.

The previous prime is 199579921. The next prime is 199579967. The reversal of 199579923 is 329975991.

It is not a de Polignac number, because 199579923 - 2¹ = 199579921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199579923.

It is not an unprimeable number, because it can be changed into a prime (199579921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89038 + ... + 91251.

It is an arithmetic number, because the mean of its divisors is an integer number (18930450).

Almost surely, 2^199579923 is an apocalyptic number.

199579923 is a deficient number, since it is larger than the sum of its proper divisors (103307277).

199579923 is a wasteful number, since it uses less digits than its factorization.

199579923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180339 (or 180333 counting only the distinct ones).

The product of its digits is 1377810, while the sum is 54.

The square root of 199579923 is about 14127.2758520530. The cubic root of 199579923 is about 584.3938231157.

It can be divided in two parts, 1995 and 79923, that added together give a palindrome (81918).

The spelling of 199579923 in words is "one hundred ninety-nine million, five hundred seventy-nine thousand, nine hundred twenty-three".