198917845 has 8 divisors (see below), whose sum is σ = 272801664. Its totient is φ = 136400784.

The previous prime is 198917843. The next prime is 198917857. The reversal of 198917845 is 548719891.

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 198917845 - 2¹ = 198917843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198917792 and 198917801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198917843) 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 7 ways as a sum of consecutive naturals, for example, 2841649 + ... + 2841718.

It is an arithmetic number, because the mean of its divisors is an integer number (34100208).

Almost surely, 2^198917845 is an apocalyptic number.

It is an amenable number.

198917845 is a deficient number, since it is larger than the sum of its proper divisors (73883819).

198917845 is an equidigital number, since it uses as much as digits as its factorization.

198917845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683379.

The product of its digits is 725760, while the sum is 52.

The square root of 198917845 is about 14103.8237722966. The cubic root of 198917845 is about 583.7468927658.

The spelling of 198917845 in words is "one hundred ninety-eight million, nine hundred seventeen thousand, eight hundred forty-five".