181218 has 8 divisors (see below), whose sum is σ = 362448. Its totient is φ = 60404.

The previous prime is 181213. The next prime is 181219. The reversal of 181218 is 812181.

181218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

181218 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 181194 and 181203.

It is not an unprimeable number, because it can be changed into a prime (181211) by changing a digit.

181218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15096 + ... + 15107.

It is an arithmetic number, because the mean of its divisors is an integer number (45306).

2¹⁸¹²¹⁸ is an apocalyptic number.

181218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181218 is a wasteful number, since it uses less digits than its factorization.

181218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30208.

The product of its digits is 128, while the sum is 21.

The square root of 181218 is about 425.6970753952. The cubic root of 181218 is about 56.5892290975.

Adding to 181218 its reverse (812181), we get a palindrome (993399).

It can be divided in two parts, 1812 and 18, that added together give a triangular number (1830 = T₆₀).

The spelling of 181218 in words is "one hundred eighty-one thousand, two hundred eighteen".