12987397 has 2 divisors, whose sum is σ = 12987398. Its totient is φ = 12987396.

The previous prime is 12987379. The next prime is 12987409. The reversal of 12987397 is 79378921.

It is a happy number.

12987397 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (12987379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12952801 + 34596 = 3599^2 + 186^2 .

It is an emirp because it is prime and its reverse (79378921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12987397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12987307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6493698 + 6493699.

It is an arithmetic number, because the mean of its divisors is an integer number (6493699).

Almost surely, 2^12987397 is an apocalyptic number.

It is an amenable number.

12987397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12987397 is an equidigital number, since it uses as much as digits as its factorization.

12987397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 12987397 is about 3603.8031300281. The cubic root of 12987397 is about 235.0574599194.

The spelling of 12987397 in words is "twelve million, nine hundred eighty-seven thousand, three hundred ninety-seven".