12218785 has 4 divisors (see below), whose sum is σ = 14662548. Its totient is φ = 9775024.

The previous prime is 12218783. The next prime is 12218821. The reversal of 12218785 is 58781221.

12218785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7656289 + 4562496 = 2767^2 + 2136^2 .

It is a cyclic number.

It is not a de Polignac number, because 12218785 - 2¹ = 12218783 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12218785.

It is not an unprimeable number, because it can be changed into a prime (12218783) 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, 1221874 + ... + 1221883.

It is an arithmetic number, because the mean of its divisors is an integer number (3665637).

Almost surely, 2^12218785 is an apocalyptic number.

It is an amenable number.

12218785 is a deficient number, since it is larger than the sum of its proper divisors (2443763).

12218785 is an equidigital number, since it uses as much as digits as its factorization.

12218785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443762.

The product of its digits is 8960, while the sum is 34.

The square root of 12218785 is about 3495.5378699136. The cubic root of 12218785 is about 230.3258456483.

The spelling of 12218785 in words is "twelve million, two hundred eighteen thousand, seven hundred eighty-five".