198187 has 8 divisors (see below), whose sum is σ = 221760. Its totient is φ = 175560.

The previous prime is 198179. The next prime is 198193. The reversal of 198187 is 781891.

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

It is not a de Polignac number, because 198187 - 2³ = 198179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198127) 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, 264 + ... + 682.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2¹⁹⁸¹⁸⁷ is an apocalyptic number.

198187 is a deficient number, since it is larger than the sum of its proper divisors (23573).

198187 is a wasteful number, since it uses less digits than its factorization.

198187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473.

The product of its digits is 4032, while the sum is 34.

The square root of 198187 is about 445.1819852600. The cubic root of 198187 is about 58.3031099671.

The spelling of 198187 in words is "one hundred ninety-eight thousand, one hundred eighty-seven".