198856209 has 16 divisors (see below), whose sum is σ = 272043200. Its totient is φ = 129136896.

The previous prime is 198856169. The next prime is 198856213. The reversal of 198856209 is 902658891.

It is a happy number.

198856209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198856209 - 2⁷ = 198856081 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198856309) 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, 50877 + ... + 54645.

It is an arithmetic number, because the mean of its divisors is an integer number (17002700).

Almost surely, 2^198856209 is an apocalyptic number.

198856209 is the 7538-th nonagonal number.

It is an amenable number.

198856209 is a deficient number, since it is larger than the sum of its proper divisors (73186991).

198856209 is a wasteful number, since it uses less digits than its factorization.

198856209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 198856209 is about 14101.6385218172. The cubic root of 198856209 is about 583.6865939352.

The spelling of 198856209 in words is "one hundred ninety-eight million, eight hundred fifty-six thousand, two hundred nine".