198398817 has 12 divisors (see below), whose sum is σ = 301659280. Its totient is φ = 125304408.

The previous prime is 198398813. The next prime is 198398843. The reversal of 198398817 is 718893891.

It is not a de Polignac number, because 198398817 - 2² = 198398813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198398813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 579943 + ... + 580284.

Almost surely, 2^198398817 is an apocalyptic number.

It is an amenable number.

198398817 is a deficient number, since it is larger than the sum of its proper divisors (103260463).

198398817 is a wasteful number, since it uses less digits than its factorization.

198398817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160252 (or 1160249 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 198398817 is about 14085.4114955865. The cubic root of 198398817 is about 583.2387350999.

The spelling of 198398817 in words is "one hundred ninety-eight million, three hundred ninety-eight thousand, eight hundred seventeen".