11818 has 8 divisors (see below), whose sum is σ = 18720. Its totient is φ = 5580.

The previous prime is 11813. The next prime is 11821. The reversal of 11818 is 81811.

11818 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.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a plaindrome in base 15.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 11795 and 11804.

It is not an unprimeable number, because it can be changed into a prime (11813) by changing a digit.

11818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118 + ... + 193.

It is an arithmetic number, because the mean of its divisors is an integer number (2340).

2¹¹⁸¹⁸ is an apocalyptic number.

11818 is a deficient number, since it is larger than the sum of its proper divisors (6902).

11818 is a wasteful number, since it uses less digits than its factorization.

11818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332.

The product of its digits is 64, while the sum is 19.

The square root of 11818 is about 108.7106250557. The cubic root of 11818 is about 22.7779513945. Note that the first 3 decimals are identical.

It can be divided in two parts, 118 and 18, that added together give a triangular number (136 = T₁₆).

The spelling of 11818 in words is "eleven thousand, eight hundred eighteen".