12185689 has 2 divisors, whose sum is σ = 12185690. Its totient is φ = 12185688.

The previous prime is 12185681. The next prime is 12185729. The reversal of 12185689 is 98658121.

It is an a-pointer prime, because the next prime (12185729) can be obtained adding 12185689 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8363664 + 3822025 = 2892^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 12185689 - 2³ = 12185681 is a prime.

It is not a weakly prime, because it can be changed into another prime (12185681) by changing a digit.

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 as a sum of consecutive naturals, namely, 6092844 + 6092845.

It is an arithmetic number, because the mean of its divisors is an integer number (6092845).

Almost surely, 2^12185689 is an apocalyptic number.

It is an amenable number.

12185689 is a deficient number, since it is larger than the sum of its proper divisors (1).

12185689 is an equidigital number, since it uses as much as digits as its factorization.

12185689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 40.

The square root of 12185689 is about 3490.8006244986. The cubic root of 12185689 is about 230.1177028301.

The spelling of 12185689 in words is "twelve million, one hundred eighty-five thousand, six hundred eighty-nine".