2213818 has 4 divisors (see below), whose sum is σ = 3320730. Its totient is φ = 1106908.

The previous prime is 2213789. The next prime is 2213833. The reversal of 2213818 is 8183122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8183122 = 2 ⋅4091561.

It can be written as a sum of positive squares in only one way, i.e., 1361889 + 851929 = 1167^2 + 923^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2213792 and 2213801.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 553453 + ... + 553456.

2^2213818 is an apocalyptic number.

2213818 is a deficient number, since it is larger than the sum of its proper divisors (1106912).

2213818 is a wasteful number, since it uses less digits than its factorization.

2213818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106911.

The product of its digits is 768, while the sum is 25.

The square root of 2213818 is about 1487.8904529568. The cubic root of 2213818 is about 130.3308731309.

The spelling of 2213818 in words is "two million, two hundred thirteen thousand, eight hundred eighteen".