198560218 has 4 divisors (see below), whose sum is σ = 297840330. Its totient is φ = 99280108.

The previous prime is 198560213. The next prime is 198560227. The reversal of 198560218 is 812065891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 107682129 + 90878089 = 10377^2 + 9533^2 .

It is a super-4 number, since 4×198560218⁴ (a number of 34 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (198560213) by changing a digit.

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 as a sum of consecutive naturals, namely, 49640053 + ... + 49640056.

Almost surely, 2^198560218 is an apocalyptic number.

198560218 is a deficient number, since it is larger than the sum of its proper divisors (99280112).

198560218 is an equidigital number, since it uses as much as digits as its factorization.

198560218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99280111.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 198560218 is about 14091.1396984062. The cubic root of 198560218 is about 583.3968506255.

The spelling of 198560218 in words is "one hundred ninety-eight million, five hundred sixty thousand, two hundred eighteen".