198786 has 16 divisors (see below), whose sum is σ = 454464. Its totient is φ = 56784.

The previous prime is 198769. The next prime is 198811. The reversal of 198786 is 687891.

It is an unprimeable number.

198786 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2325 + ... + 2408.

It is an arithmetic number, because the mean of its divisors is an integer number (28404).

2¹⁹⁸⁷⁸⁶ is an apocalyptic number.

198786 is an abundant number, since it is smaller than the sum of its proper divisors (255678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198786 is a wasteful number, since it uses less digits than its factorization.

198786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745.

The product of its digits is 24192, while the sum is 39.

The square root of 198786 is about 445.8542362701. The cubic root of 198786 is about 58.3617892911.

The spelling of 198786 in words is "one hundred ninety-eight thousand, seven hundred eighty-six".