198605 has 16 divisors (see below), whose sum is σ = 273024. Its totient is φ = 137280.

The previous prime is 198599. The next prime is 198613. The reversal of 198605 is 506891.

It is not a de Polignac number, because 198605 - 2⁴ = 198589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1187 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (17064).

2¹⁹⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

198605 is a deficient number, since it is larger than the sum of its proper divisors (74419).

198605 is a wasteful number, since it uses less digits than its factorization.

198605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 198605 is about 445.6512089067. The cubic root of 198605 is about 58.3440705859.

The spelling of 198605 in words is "one hundred ninety-eight thousand, six hundred five".