12218705 has 4 divisors (see below), whose sum is σ = 14662452. Its totient is φ = 9774960.

The previous prime is 12218663. The next prime is 12218707. The reversal of 12218705 is 50781221.

12218705 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, and also an emirpimes, since its reverse is a distinct semiprime: 50781221 = 1433 ⋅35437.

It can be written as a sum of positive squares in 2 ways, for example, as 3598609 + 8620096 = 1897^2 + 2936^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12218705 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12218707) 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, 1221866 + ... + 1221875.

It is an arithmetic number, because the mean of its divisors is an integer number (3665613).

Almost surely, 2^12218705 is an apocalyptic number.

It is an amenable number.

12218705 is a deficient number, since it is larger than the sum of its proper divisors (2443747).

12218705 is an equidigital number, since it uses as much as digits as its factorization.

12218705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443746.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12218705 is about 3495.5264267346. The cubic root of 12218705 is about 230.3253429767.

Adding to 12218705 its reverse (50781221), we get a palindrome (62999926).

The spelling of 12218705 in words is "twelve million, two hundred eighteen thousand, seven hundred five".