198945845 has 8 divisors (see below), whose sum is σ = 272840064. Its totient is φ = 136419984.

The previous prime is 198945823. The next prime is 198945853. The reversal of 198945845 is 548549891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198945845 - 2⁸ = 198945589 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2842049 + ... + 2842118.

It is an arithmetic number, because the mean of its divisors is an integer number (34105008).

Almost surely, 2^198945845 is an apocalyptic number.

It is an amenable number.

198945845 is a deficient number, since it is larger than the sum of its proper divisors (73894219).

198945845 is an equidigital number, since it uses as much as digits as its factorization.

198945845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5684179.

The product of its digits is 2073600, while the sum is 53.

The square root of 198945845 is about 14104.8163759760. The cubic root of 198945845 is about 583.7742812020.

The spelling of 198945845 in words is "one hundred ninety-eight million, nine hundred forty-five thousand, eight hundred forty-five".