198587 has 4 divisors (see below), whose sum is σ = 201456. Its totient is φ = 195720.

The previous prime is 198571. The next prime is 198589. The reversal of 198587 is 785891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 785891 = 283 ⋅2777.

It is a cyclic number.

It is not a de Polignac number, because 198587 - 2⁴ = 198571 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 198587.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198587.

It is not an unprimeable number, because it can be changed into a prime (198589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328 + ... + 1469.

It is an arithmetic number, because the mean of its divisors is an integer number (50364).

2¹⁹⁸⁵⁸⁷ is an apocalyptic number.

198587 is a deficient number, since it is larger than the sum of its proper divisors (2869).

198587 is an equidigital number, since it uses as much as digits as its factorization.

198587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868.

The product of its digits is 20160, while the sum is 38.

The square root of 198587 is about 445.6310132834. The cubic root of 198587 is about 58.3423079162.

The spelling of 198587 in words is "one hundred ninety-eight thousand, five hundred eighty-seven".