12216745 has 8 divisors (see below), whose sum is σ = 14704200. Its totient is φ = 9744000.

The previous prime is 12216731. The next prime is 12216751. The reversal of 12216745 is 54761221.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 10323369 = 1376^2 + 3213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12216745 - 2¹⁷ = 12085673 is a prime.

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, 1756 + ... + 5245.

It is an arithmetic number, because the mean of its divisors is an integer number (1838025).

Almost surely, 2^12216745 is an apocalyptic number.

It is an amenable number.

12216745 is a deficient number, since it is larger than the sum of its proper divisors (2487455).

12216745 is an equidigital number, since it uses as much as digits as its factorization.

12216745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7355.

The product of its digits is 3360, while the sum is 28.

The square root of 12216745 is about 3495.2460571468. The cubic root of 12216745 is about 230.3130268376.

Adding to 12216745 its reverse (54761221), we get a palindrome (66977966).

The spelling of 12216745 in words is "twelve million, two hundred sixteen thousand, seven hundred forty-five".