12387217 has 2 divisors, whose sum is σ = 12387218. Its totient is φ = 12387216.

The previous prime is 12387149. The next prime is 12387233. The reversal of 12387217 is 71278321.

12387217 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8856576 + 3530641 = 2976^2 + 1879^2 .

It is an emirp because it is prime and its reverse (71278321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12387217 - 2²³ = 3998609 is a prime.

It is not a weakly prime, because it can be changed into another prime (12387517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6193608 + 6193609.

It is an arithmetic number, because the mean of its divisors is an integer number (6193609).

Almost surely, 2^12387217 is an apocalyptic number.

It is an amenable number.

12387217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12387217 is an equidigital number, since it uses as much as digits as its factorization.

12387217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 12387217 is about 3519.5478402772. The cubic root of 12387217 is about 231.3793421064.

The spelling of 12387217 in words is "twelve million, three hundred eighty-seven thousand, two hundred seventeen".