18786216 has 32 divisors (see below), whose sum is σ = 49008960. Its totient is φ = 5989632.

The previous prime is 18786199. The next prime is 18786223. The reversal of 18786216 is 61268781.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 16465 + ... + 17568.

It is an arithmetic number, because the mean of its divisors is an integer number (1531530).

Almost surely, 2^18786216 is an apocalyptic number.

It is an amenable number.

18786216 is an abundant number, since it is smaller than the sum of its proper divisors (30222744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18786216 is a wasteful number, since it uses less digits than its factorization.

18786216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34065 (or 34061 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 18786216 is about 4334.3068650016. The cubic root of 18786216 is about 265.8355778110.

The spelling of 18786216 in words is "eighteen million, seven hundred eighty-six thousand, two hundred sixteen".