198772818 has 16 divisors (see below), whose sum is σ = 398173536. Its totient is φ = 66152960.

The previous prime is 198772817. The next prime is 198772883. The reversal of 198772818 is 818277891.

It is a super-2 number, since 2×198772818² = 79021266351322248, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198772817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21996 + ... + 29687.

It is an arithmetic number, because the mean of its divisors is an integer number (24885846).

Almost surely, 2^198772818 is an apocalyptic number.

198772818 is an abundant number, since it is smaller than the sum of its proper divisors (199400718).

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

198772818 is a wasteful number, since it uses less digits than its factorization.

198772818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52329.

The product of its digits is 451584, while the sum is 51.

The square root of 198772818 is about 14098.6814277081. The cubic root of 198772818 is about 583.6049922350.

The spelling of 198772818 in words is "one hundred ninety-eight million, seven hundred seventy-two thousand, eight hundred eighteen".