198965 has 8 divisors (see below), whose sum is σ = 257208. Its totient is φ = 146880.

The previous prime is 198959. The next prime is 198967. The reversal of 198965 is 569891.

It can be written as a sum of positive squares in 4 ways, for example, as 31684 + 167281 = 178^2 + 409^2 .

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

It is not a de Polignac number, because 198965 - 2⁶ = 198901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198967) 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, 1466 + ... + 1595.

It is an arithmetic number, because the mean of its divisors is an integer number (32151).

2¹⁹⁸⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

198965 is a deficient number, since it is larger than the sum of its proper divisors (58243).

198965 is a wasteful number, since it uses less digits than its factorization.

198965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079.

The product of its digits is 19440, while the sum is 38.

The square root of 198965 is about 446.0549293529. The cubic root of 198965 is about 58.3793016347.

The spelling of 198965 in words is "one hundred ninety-eight thousand, nine hundred sixty-five".