198418 has 16 divisors (see below), whose sum is σ = 336960. Its totient is φ = 86800.

The previous prime is 198413. The next prime is 198427. The reversal of 198418 is 814891.

It is a self number, because there is not a number n which added to its sum of digits gives 198418.

It is not an unprimeable number, because it can be changed into a prime (198413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483 + ... + 793.

It is an arithmetic number, because the mean of its divisors is an integer number (21060).

2¹⁹⁸⁴¹⁸ is an apocalyptic number.

198418 is a deficient number, since it is larger than the sum of its proper divisors (138542).

198418 is a wasteful number, since it uses less digits than its factorization.

198418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its digits is 2304, while the sum is 31.

The square root of 198418 is about 445.4413541646. The cubic root of 198418 is about 58.3257532101.

It can be divided in two parts, 1984 and 18, that added together give a palindrome (2002).

The spelling of 198418 in words is "one hundred ninety-eight thousand, four hundred eighteen".