198887 has 4 divisors (see below), whose sum is σ = 214200. Its totient is φ = 183576.

The previous prime is 198859. The next prime is 198899. The reversal of 198887 is 788891.

198887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198887 - 2⁶ = 198823 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 (198817) 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, 7637 + ... + 7662.

It is an arithmetic number, because the mean of its divisors is an integer number (53550).

2¹⁹⁸⁸⁸⁷ is an apocalyptic number.

198887 is a deficient number, since it is larger than the sum of its proper divisors (15313).

198887 is a wasteful number, since it uses less digits than its factorization.

198887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15312.

The product of its digits is 32256, while the sum is 41.

The square root of 198887 is about 445.9674876042. The cubic root of 198887 is about 58.3716718493.

The spelling of 198887 in words is "one hundred ninety-eight thousand, eight hundred eighty-seven".