12402391 has 2 divisors, whose sum is σ = 12402392. Its totient is φ = 12402390.

The previous prime is 12402389. The next prime is 12402431. The reversal of 12402391 is 19320421.

It is a weak prime.

It is an emirp because it is prime and its reverse (19320421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12402391 - 2¹ = 12402389 is a prime.

Together with 12402389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12402311) 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, 6201195 + 6201196.

It is an arithmetic number, because the mean of its divisors is an integer number (6201196).

Almost surely, 2^12402391 is an apocalyptic number.

12402391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12402391 is an equidigital number, since it uses as much as digits as its factorization.

12402391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12402391 is about 3521.7028551540. The cubic root of 12402391 is about 231.4737813310.

The spelling of 12402391 in words is "twelve million, four hundred two thousand, three hundred ninety-one".