199787898 has 16 divisors (see below), whose sum is σ = 403533216. Its totient is φ = 65936400.

The previous prime is 199787881. The next prime is 199787941. The reversal of 199787898 is 898787991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164236 + ... + 165447.

It is an arithmetic number, because the mean of its divisors is an integer number (25220826).

Almost surely, 2^199787898 is an apocalyptic number.

199787898 is an abundant number, since it is smaller than the sum of its proper divisors (203745318).

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

199787898 is a wasteful number, since it uses less digits than its factorization.

199787898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329789.

The product of its digits is 18289152, while the sum is 66.

The square root of 199787898 is about 14134.6346963761. The cubic root of 199787898 is about 584.5967445163.

The spelling of 199787898 in words is "one hundred ninety-nine million, seven hundred eighty-seven thousand, eight hundred ninety-eight".