198908897 has 4 divisors (see below), whose sum is σ = 216991536. Its totient is φ = 180826260.

The previous prime is 198908893. The next prime is 198908903. The reversal of 198908897 is 798809891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198908897 - 2² = 198908893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198908893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9041303 + ... + 9041324.

It is an arithmetic number, because the mean of its divisors is an integer number (54247884).

Almost surely, 2^198908897 is an apocalyptic number.

It is an amenable number.

198908897 is a deficient number, since it is larger than the sum of its proper divisors (18082639).

198908897 is a wasteful number, since it uses less digits than its factorization.

198908897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18082638.

The product of its (nonzero) digits is 2612736, while the sum is 59.

The square root of 198908897 is about 14103.5065497911. The cubic root of 198908897 is about 583.7381396622.

The spelling of 198908897 in words is "one hundred ninety-eight million, nine hundred eight thousand, eight hundred ninety-seven".