12127309 has 2 divisors, whose sum is σ = 12127310. Its totient is φ = 12127308.

The previous prime is 12127289. The next prime is 12127319. The reversal of 12127309 is 90372121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 635209 = 3390^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 12127309 - 2¹⁵ = 12094541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12127319) 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, 6063654 + 6063655.

It is an arithmetic number, because the mean of its divisors is an integer number (6063655).

Almost surely, 2^12127309 is an apocalyptic number.

It is an amenable number.

12127309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12127309 is an equidigital number, since it uses as much as digits as its factorization.

12127309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12127309 is about 3482.4286065905. The cubic root of 12127309 is about 229.7496267285.

The spelling of 12127309 in words is "twelve million, one hundred twenty-seven thousand, three hundred nine".