18266216 has 16 divisors (see below), whose sum is σ = 34296900. Its totient is φ = 9120384.

The previous prime is 18266207. The next prime is 18266231. The reversal of 18266216 is 61266281.

It can be written as a sum of positive squares in 2 ways, for example, as 13293316 + 4972900 = 3646^2 + 2230^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7700 + ... + 9788.

Almost surely, 2^18266216 is an apocalyptic number.

It is an amenable number.

18266216 is a deficient number, since it is larger than the sum of its proper divisors (16030684).

18266216 is a wasteful number, since it uses less digits than its factorization.

18266216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3188 (or 3184 counting only the distinct ones).

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

The square root of 18266216 is about 4273.8993904864. The cubic root of 18266216 is about 263.3598278457.

The spelling of 18266216 in words is "eighteen million, two hundred sixty-six thousand, two hundred sixteen".