198992218 has 16 divisors (see below), whose sum is σ = 306108000. Its totient is φ = 96966576.

The previous prime is 198992207. The next prime is 198992221. The reversal of 198992218 is 812299891.

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, 40596 + ... + 45232.

It is an arithmetic number, because the mean of its divisors is an integer number (19131750).

Almost surely, 2^198992218 is an apocalyptic number.

198992218 is a deficient number, since it is larger than the sum of its proper divisors (107115782).

198992218 is a wasteful number, since it uses less digits than its factorization.

198992218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5181.

The product of its digits is 186624, while the sum is 49.

The square root of 198992218 is about 14106.4601512924. The cubic root of 198992218 is about 583.8196356914.

The spelling of 198992218 in words is "one hundred ninety-eight million, nine hundred ninety-two thousand, two hundred eighteen".