18216612 has 36 divisors (see below), whose sum is σ = 46702656. Its totient is φ = 5985840.

The previous prime is 18216599. The next prime is 18216637. The reversal of 18216612 is 21661281.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 1008 + ... + 6119.

It is an arithmetic number, because the mean of its divisors is an integer number (1297296).

Almost surely, 2^18216612 is an apocalyptic number.

18216612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18216612 is an abundant number, since it is smaller than the sum of its proper divisors (28486044).

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

18216612 is a wasteful number, since it uses less digits than its factorization.

18216612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7208 (or 7203 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 18216612 is about 4268.0923139033. The cubic root of 18216612 is about 263.1212171395.

Adding to 18216612 its reverse (21661281), we get a palindrome (39877893).

The spelling of 18216612 in words is "eighteen million, two hundred sixteen thousand, six hundred twelve".