198404 has 12 divisors (see below), whose sum is σ = 350364. Its totient is φ = 98304.

The previous prime is 198397. The next prime is 198409. The reversal of 198404 is 404891.

It can be written as a sum of positive squares in 2 ways, for example, as 136900 + 61504 = 370^2 + 248^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198404.

It is not an unprimeable number, because it can be changed into a prime (198409) by changing a digit.

198404 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644 + ... + 900.

It is an arithmetic number, because the mean of its divisors is an integer number (29197).

2¹⁹⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

198404 is a deficient number, since it is larger than the sum of its proper divisors (151960).

198404 is a wasteful number, since it uses less digits than its factorization.

198404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 198404 is about 445.4256391363. The cubic root of 198404 is about 58.3243813927.

The spelling of 198404 in words is "one hundred ninety-eight thousand, four hundred four".