186

186 is a natural number that follows 185 and precedes 187. It is even and composite, with prime factorization 2 × 3 × 31.

Because 186 is the product of three distinct primes, it is squarefree. The divisors of 186 are 1, 2, 3, 6, 31, 62, 93, and 186. The sum of all divisors is 384, so the sum of proper divisors is 198. This makes 186 an abundant number, since the proper divisors sum to more than the number itself.

186 is not a prime and not a perfect square. In common numeral systems, it is written as CLXXXVI in Roman numerals, 10111010 in binary, and BA in hexadecimal.

As a calendar year, 186 can designate years in the ancient world, such as 186 BC and 186 AD, used in historical and chronological contexts.