209868198 has 16 divisors (see below), whose sum is σ = 419879856. Its totient is φ = 69932160.

The previous prime is 209868193. The next prime is 209868209. The reversal of 209868198 is 891868902.

209868198 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 209868198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209868193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27258 + ... + 34098.

It is an arithmetic number, because the mean of its divisors is an integer number (26242491).

Almost surely, 2^209868198 is an apocalyptic number.

209868198 is an abundant number, since it is smaller than the sum of its proper divisors (210011658).

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

209868198 is a wasteful number, since it uses less digits than its factorization.

209868198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11959.

The product of its (nonzero) digits is 497664, while the sum is 51.

The square root of 209868198 is about 14486.8284313717. The cubic root of 209868198 is about 594.2678167434.

The spelling of 209868198 in words is "two hundred nine million, eight hundred sixty-eight thousand, one hundred ninety-eight".