198717 has 4 divisors (see below), whose sum is σ = 264960. Its totient is φ = 132476.

The previous prime is 198701. The next prime is 198719. The reversal of 198717 is 717891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 717891 = 3 ⋅239297.

It is a cyclic number.

It is not a de Polignac number, because 198717 - 2⁴ = 198701 is a prime.

It is an Ulam number.

It is a D-number.

198717 is a lucky number.

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 198717.

It is not an unprimeable number, because it can be changed into a prime (198719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33117 + ... + 33122.

It is an arithmetic number, because the mean of its divisors is an integer number (66240).

2¹⁹⁸⁷¹⁷ is an apocalyptic number.

It is an amenable number.

198717 is a deficient number, since it is larger than the sum of its proper divisors (66243).

198717 is an equidigital number, since it uses as much as digits as its factorization.

198717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66242.

The product of its digits is 3528, while the sum is 33.

The square root of 198717 is about 445.7768500046. The cubic root of 198717 is about 58.3550359156.

The spelling of 198717 in words is "one hundred ninety-eight thousand, seven hundred seventeen".