198565 has 8 divisors (see below), whose sum is σ = 240768. Its totient is φ = 157200.

The previous prime is 198553. The next prime is 198571. The reversal of 198565 is 565891.

198565 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 198565 - 2⁵ = 198533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624 + ... + 886.

It is an arithmetic number, because the mean of its divisors is an integer number (30096).

2¹⁹⁸⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

198565 is a deficient number, since it is larger than the sum of its proper divisors (42203).

198565 is a wasteful number, since it uses less digits than its factorization.

198565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its digits is 10800, while the sum is 34.

The square root of 198565 is about 445.6063285008. The cubic root of 198565 is about 58.3401533976.

It can be divided in two parts, 19 and 8565, that multiplied together give a triangular number (162735 = T₅₇₀).

The spelling of 198565 in words is "one hundred ninety-eight thousand, five hundred sixty-five".