223818 has 24 divisors (see below), whose sum is σ = 518688. Its totient is φ = 63072.

The previous prime is 223781. The next prime is 223823. The reversal of 223818 is 818322.

223818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 6.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3030 + ... + 3102.

It is an arithmetic number, because the mean of its divisors is an integer number (21612).

2²²³⁸¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 223818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259344).

223818 is an abundant number, since it is smaller than the sum of its proper divisors (294870).

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

223818 is an equidigital number, since it uses as much as digits as its factorization.

223818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 85 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 223818 is about 473.0940709838. The cubic root of 223818 is about 60.7153267905.

The spelling of 223818 in words is "two hundred twenty-three thousand, eight hundred eighteen".