198455818 has 8 divisors (see below), whose sum is σ = 324745920. Its totient is φ = 90207180.

The previous prime is 198455813. The next prime is 198455837. The reversal of 198455818 is 818554891.

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

It is not an unprimeable number, because it can be changed into a prime (198455813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4510338 + ... + 4510381.

It is an arithmetic number, because the mean of its divisors is an integer number (40593240).

Almost surely, 2^198455818 is an apocalyptic number.

198455818 is a deficient number, since it is larger than the sum of its proper divisors (126290102).

198455818 is a wasteful number, since it uses less digits than its factorization.

198455818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9020732.

The product of its digits is 460800, while the sum is 49.

The square root of 198455818 is about 14087.4347558383. The cubic root of 198455818 is about 583.2945855804.

The spelling of 198455818 in words is "one hundred ninety-eight million, four hundred fifty-five thousand, eight hundred eighteen".