199812123 has 32 divisors (see below), whose sum is σ = 339033600. Its totient is φ = 113933088.

The previous prime is 199812097. The next prime is 199812133. The reversal of 199812123 is 321218991.

It is not a de Polignac number, because 199812123 - 2⁵ = 199812091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199812133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122608 + ... + 124226.

It is an arithmetic number, because the mean of its divisors is an integer number (10594800).

Almost surely, 2^199812123 is an apocalyptic number.

199812123 is a deficient number, since it is larger than the sum of its proper divisors (139221477).

199812123 is a wasteful number, since it uses less digits than its factorization.

199812123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288 (or 2282 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 199812123 is about 14135.4916080057. The cubic root of 199812123 is about 584.6203717128.

The spelling of 199812123 in words is "one hundred ninety-nine million, eight hundred twelve thousand, one hundred twenty-three".