18216286 has 8 divisors (see below), whose sum is σ = 29808504. Its totient is φ = 8280120.

The previous prime is 18216281. The next prime is 18216311. The reversal of 18216286 is 68261281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18216281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413985 + ... + 414028.

It is an arithmetic number, because the mean of its divisors is an integer number (3726063).

Almost surely, 2^18216286 is an apocalyptic number.

18216286 is a deficient number, since it is larger than the sum of its proper divisors (11592218).

18216286 is a wasteful number, since it uses less digits than its factorization.

18216286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828026.

The product of its digits is 9216, while the sum is 34.

The square root of 18216286 is about 4268.0541233682. The cubic root of 18216286 is about 263.1196475460.

The spelling of 18216286 in words is "eighteen million, two hundred sixteen thousand, two hundred eighty-six".