222818 has 4 divisors (see below), whose sum is σ = 334230. Its totient is φ = 111408.

The previous prime is 222799. The next prime is 222823. The reversal of 222818 is 818222.

222818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 196249 + 26569 = 443^2 + 163^2 .

It is a super-2 number, since 2×222818² = 99295722248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222793 and 222802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55703 + ... + 55706.

2²²²⁸¹⁸ is an apocalyptic number.

222818 is a deficient number, since it is larger than the sum of its proper divisors (111412).

222818 is a wasteful number, since it uses less digits than its factorization.

222818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111411.

The product of its digits is 512, while the sum is 23.

The square root of 222818 is about 472.0360155751. The cubic root of 222818 is about 60.6247681289.

It can be divided in two parts, 2228 and 18, that multiplied together give a palindrome (40104).

The spelling of 222818 in words is "two hundred twenty-two thousand, eight hundred eighteen".