198609 has 8 divisors (see below), whose sum is σ = 266880. Its totient is φ = 131376.

The previous prime is 198599. The next prime is 198613. The reversal of 198609 is 906891.

It is a happy number.

198609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198609 - 2⁴ = 198593 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

198609 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 198609.

It is not an unprimeable number, because it can be changed into a prime (198659) 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, 579 + ... + 855.

It is an arithmetic number, because the mean of its divisors is an integer number (33360).

2¹⁹⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

198609 is a deficient number, since it is larger than the sum of its proper divisors (68271).

198609 is a wasteful number, since it uses less digits than its factorization.

198609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 198609 is about 445.6556966987. The cubic root of 198609 is about 58.3444622758.

The spelling of 198609 in words is "one hundred ninety-eight thousand, six hundred nine".