198905998 has 4 divisors (see below), whose sum is σ = 298359000. Its totient is φ = 99452998.

The previous prime is 198905981. The next prime is 198906031. The reversal of 198905998 is 899509891.

It is a happy number.

198905998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899509891 = 7 ⋅128501413.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49726498 + ... + 49726501.

It is an arithmetic number, because the mean of its divisors is an integer number (74589750).

Almost surely, 2^198905998 is an apocalyptic number.

198905998 is a deficient number, since it is larger than the sum of its proper divisors (99453002).

198905998 is an equidigital number, since it uses as much as digits as its factorization.

198905998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99453001.

The product of its (nonzero) digits is 2099520, while the sum is 58.

The square root of 198905998 is about 14103.4037735576. The cubic root of 198905998 is about 583.7353037490.

The spelling of 198905998 in words is "one hundred ninety-eight million, nine hundred five thousand, nine hundred ninety-eight".