198699918 has 16 divisors (see below), whose sum is σ = 398583120. Its totient is φ = 66036096.

The previous prime is 198699901. The next prime is 198699937. The reversal of 198699918 is 819996891.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 47113 + ... + 51156.

It is an arithmetic number, because the mean of its divisors is an integer number (24911445).

Almost surely, 2^198699918 is an apocalyptic number.

198699918 is an abundant number, since it is smaller than the sum of its proper divisors (199883202).

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

198699918 is a wasteful number, since it uses less digits than its factorization.

198699918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98611.

The product of its digits is 2519424, while the sum is 60.

The square root of 198699918 is about 14096.0958424665. The cubic root of 198699918 is about 583.5336377334.

The spelling of 198699918 in words is "one hundred ninety-eight million, six hundred ninety-nine thousand, nine hundred eighteen".