18662216 has 16 divisors (see below), whose sum is σ = 35845740. Its totient is φ = 9103360.

The previous prime is 18662207. The next prime is 18662233. The reversal of 18662216 is 61226681.

It can be written as a sum of positive squares in 2 ways, for example, as 12180100 + 6482116 = 3490^2 + 2546^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28121 + ... + 28776.

Almost surely, 2^18662216 is an apocalyptic number.

It is an amenable number.

18662216 is a deficient number, since it is larger than the sum of its proper divisors (17183524).

18662216 is a wasteful number, since it uses less digits than its factorization.

18662216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56944 (or 56940 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 18662216 is about 4319.9787036512. The cubic root of 18662216 is about 265.2493961634.

Adding to 18662216 its reverse (61226681), we get a palindrome (79888897).

The spelling of 18662216 in words is "eighteen million, six hundred sixty-two thousand, two hundred sixteen".