2186 has 4 divisors (see below), whose sum is σ = 3282. Its totient is φ = 1092.

The previous prime is 2179. The next prime is 2203. The reversal of 2186 is 6812.

2186 is nontrivially palindromic in base 3.

It is a Cunningham number, because it is equal to 3⁷-1.

2186 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

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

It can be written as a sum of positive squares in only one way, i.e., 1225 + 961 = 35^2 + 31^2 .

It is a Curzon number.

2186 is a nontrivial repdigit in base 3.

It is a plaindrome in base 3, base 9, base 15 and base 16.

It is a nialpdrome in base 3, base 5, base 13 and base 14.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545 + ... + 548.

2²¹⁸⁶ is an apocalyptic number.

2186 is a deficient number, since it is larger than the sum of its proper divisors (1096).

2186 is a wasteful number, since it uses less digits than its factorization.

2186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095.

The product of its digits is 96, while the sum is 17.

The square root of 2186 is about 46.7546789102. The cubic root of 2186 is about 12.9782674367.

Adding to 2186 its reverse (6812), we get a palindrome (8998).

The spelling of 2186 in words is "two thousand, one hundred eighty-six".