198019994 has 16 divisors (see below), whose sum is σ = 304217856. Its totient is φ = 96642000.

The previous prime is 198019979. The next prime is 198020021. The reversal of 198019994 is 499910891.

It is a Curzon number.

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, 7439 + ... + 21245.

It is an arithmetic number, because the mean of its divisors is an integer number (19013616).

Almost surely, 2^198019994 is an apocalyptic number.

198019994 is a deficient number, since it is larger than the sum of its proper divisors (106197862).

198019994 is a wasteful number, since it uses less digits than its factorization.

198019994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13981.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 198019994 is about 14071.9577173896. The cubic root of 198019994 is about 582.8672862781.

The spelling of 198019994 in words is "one hundred ninety-eight million, nineteen thousand, nine hundred ninety-four".