12218805 has 48 divisors (see below), whose sum is σ = 23063040. Its totient is φ = 5961600.

The previous prime is 12218783. The next prime is 12218821. The reversal of 12218805 is 50881221.

12218805 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12218805 - 2⁶ = 12218741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26275 + ... + 26735.

It is an arithmetic number, because the mean of its divisors is an integer number (480480).

Almost surely, 2^12218805 is an apocalyptic number.

12218805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12218805 is a deficient number, since it is larger than the sum of its proper divisors (10844235).

12218805 is a wasteful number, since it uses less digits than its factorization.

12218805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 12218805 is about 3495.5407307025. The cubic root of 12218805 is about 230.3259713159.

The spelling of 12218805 in words is "twelve million, two hundred eighteen thousand, eight hundred five".