18212 has 12 divisors (see below), whose sum is σ = 33180. Its totient is φ = 8736.

The previous prime is 18211. The next prime is 18217. The reversal of 18212 is 21281.

It can be written as a sum of positive squares in 2 ways, for example, as 7396 + 10816 = 86^2 + 104^2 .

It is an Ulam number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (18211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38 + ... + 194.

It is an arithmetic number, because the mean of its divisors is an integer number (2765).

2¹⁸²¹² is an apocalyptic number.

It is an amenable number.

18212 is a deficient number, since it is larger than the sum of its proper divisors (14968).

18212 is a wasteful number, since it uses less digits than its factorization.

18212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 188 counting only the distinct ones).

The product of its digits is 32, while the sum is 14.

The square root of 18212 is about 134.9518432627. The cubic root of 18212 is about 26.3099009983.

Adding to 18212 its reverse (21281), we get a palindrome (39493).

The spelling of 18212 in words is "eighteen thousand, two hundred twelve".