12438191 has 2 divisors, whose sum is σ = 12438192. Its totient is φ = 12438190.

The previous prime is 12438157. The next prime is 12438197. The reversal of 12438191 is 19183421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12438191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12438197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6219095 + 6219096.

It is an arithmetic number, because the mean of its divisors is an integer number (6219096).

Almost surely, 2^12438191 is an apocalyptic number.

12438191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12438191 is an equidigital number, since it uses as much as digits as its factorization.

12438191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 12438191 is about 3526.7819609383. The cubic root of 12438191 is about 231.6962868349.

The spelling of 12438191 in words is "twelve million, four hundred thirty-eight thousand, one hundred ninety-one".