12381689 has 2 divisors, whose sum is σ = 12381690. Its totient is φ = 12381688.

The previous prime is 12381641. The next prime is 12381697. The reversal of 12381689 is 98618321.

12381689 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., 12306064 + 75625 = 3508^2 + 275^2 .

It is an emirp because it is prime and its reverse (98618321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12381689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (12581689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6190844 + 6190845.

It is an arithmetic number, because the mean of its divisors is an integer number (6190845).

Almost surely, 2^12381689 is an apocalyptic number.

It is an amenable number.

12381689 is a deficient number, since it is larger than the sum of its proper divisors (1).

12381689 is an equidigital number, since it uses as much as digits as its factorization.

12381689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 12381689 is about 3518.7624244896. The cubic root of 12381689 is about 231.3449180352.

The spelling of 12381689 in words is "twelve million, three hundred eighty-one thousand, six hundred eighty-nine".