199128924 has 18 divisors (see below), whose sum is σ = 503353760. Its totient is φ = 66376296.

The previous prime is 199128907. The next prime is 199128961. The reversal of 199128924 is 429821991.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 199128924.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2765644 + ... + 2765715.

Almost surely, 2^199128924 is an apocalyptic number.

It is an amenable number.

199128924 is an abundant number, since it is smaller than the sum of its proper divisors (304224836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199128924 is a wasteful number, since it uses less digits than its factorization.

199128924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5531369 (or 5531364 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 199128924 is about 14111.3048298164. The cubic root of 199128924 is about 583.9532981670.

The spelling of 199128924 in words is "one hundred ninety-nine million, one hundred twenty-eight thousand, nine hundred twenty-four".