12642397 has 2 divisors, whose sum is σ = 12642398. Its totient is φ = 12642396.

The previous prime is 12642379. The next prime is 12642437. The reversal of 12642397 is 79324621.

Together with previous prime (12642379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10830681 + 1811716 = 3291^2 + 1346^2 .

It is an emirp because it is prime and its reverse (79324621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12642397 - 2¹⁹ = 12118109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642317) 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, 6321198 + 6321199.

It is an arithmetic number, because the mean of its divisors is an integer number (6321199).

Almost surely, 2^12642397 is an apocalyptic number.

It is an amenable number.

12642397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642397 is an equidigital number, since it uses as much as digits as its factorization.

12642397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 12642397 is about 3555.6148554083. The cubic root of 12642397 is about 232.9573807488.

The spelling of 12642397 in words is "twelve million, six hundred forty-two thousand, three hundred ninety-seven".