18216356 has 12 divisors (see below), whose sum is σ = 31920000. Its totient is φ = 9096360.

The previous prime is 18216353. The next prime is 18216361. The reversal of 18216356 is 65361281.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18216353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (2660000).

Almost surely, 2^18216356 is an apocalyptic number.

It is an amenable number.

18216356 is a deficient number, since it is larger than the sum of its proper divisors (13703644).

18216356 is a wasteful number, since it uses less digits than its factorization.

18216356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5914 (or 5912 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 18216356 is about 4268.0623238186. The cubic root of 18216356 is about 263.1199845769.

It can be divided in two parts, 182 and 16356, that multiplied together give a palindrome (2976792).

The spelling of 18216356 in words is "eighteen million, two hundred sixteen thousand, three hundred fifty-six".