12388391 has 2 divisors, whose sum is σ = 12388392. Its totient is φ = 12388390.

The previous prime is 12388381. The next prime is 12388403. The reversal of 12388391 is 19388321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12388391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12388381) 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, 6194195 + 6194196.

It is an arithmetic number, because the mean of its divisors is an integer number (6194196).

Almost surely, 2^12388391 is an apocalyptic number.

12388391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12388391 is an equidigital number, since it uses as much as digits as its factorization.

12388391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 12388391 is about 3519.7146191133. The cubic root of 12388391 is about 231.3866515439.

The spelling of 12388391 in words is "twelve million, three hundred eighty-eight thousand, three hundred ninety-one".