198687 has 8 divisors (see below), whose sum is σ = 267904. Its totient is φ = 130968.

The previous prime is 198673. The next prime is 198689. The reversal of 198687 is 786891.

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

It is not a de Polignac number, because 198687 - 2⁶ = 198623 is a prime.

It is a Duffinian 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 198687.

It is not an unprimeable number, because it can be changed into a prime (198689) 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, 13 + ... + 630.

It is an arithmetic number, because the mean of its divisors is an integer number (33488).

2¹⁹⁸⁶⁸⁷ is an apocalyptic number.

198687 is a deficient number, since it is larger than the sum of its proper divisors (69217).

198687 is a wasteful number, since it uses less digits than its factorization.

198687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749.

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

The square root of 198687 is about 445.7431996116. The cubic root of 198687 is about 58.3520991778.

The spelling of 198687 in words is "one hundred ninety-eight thousand, six hundred eighty-seven".