198358909 has 12 divisors (see below), whose sum is σ = 231120864. Its totient is φ = 169744344.

The previous prime is 198358891. The next prime is 198358931. The reversal of 198358909 is 909853891.

It is a de Polignac number, because none of the positive numbers 2^k-198358909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198358939) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 30504 + ... + 36430.

It is an arithmetic number, because the mean of its divisors is an integer number (19260072).

Almost surely, 2^198358909 is an apocalyptic number.

It is an amenable number.

198358909 is a deficient number, since it is larger than the sum of its proper divisors (32761955).

198358909 is an equidigital number, since it uses as much as digits as its factorization.

198358909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6624 (or 6617 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 198358909 is about 14083.9947813112. The cubic root of 198358909 is about 583.1996262439.

The spelling of 198358909 in words is "one hundred ninety-eight million, three hundred fifty-eight thousand, nine hundred nine".