198430818 has 32 divisors (see below), whose sum is σ = 416698560. Its totient is φ = 62905920.

The previous prime is 198430787. The next prime is 198430829. The reversal of 198430818 is 818034891.

198430818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 198430818.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3148 + ... + 20168.

It is an arithmetic number, because the mean of its divisors is an integer number (13021830).

Almost surely, 2^198430818 is an apocalyptic number.

198430818 is an abundant number, since it is smaller than the sum of its proper divisors (218267742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198430818 is a wasteful number, since it uses less digits than its factorization.

198430818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17122.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 198430818 is about 14086.5474123364. The cubic root of 198430818 is about 583.2700915022.

The spelling of 198430818 in words is "one hundred ninety-eight million, four hundred thirty thousand, eight hundred eighteen".