12867391 has 2 divisors, whose sum is σ = 12867392. Its totient is φ = 12867390.

The previous prime is 12867367. The next prime is 12867403. The reversal of 12867391 is 19376821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12867391 - 2⁹ = 12866879 is a prime.

It is a super-2 number, since 2×12867391² = 331139502293762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12867391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12867301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6433695 + 6433696.

It is an arithmetic number, because the mean of its divisors is an integer number (6433696).

Almost surely, 2^12867391 is an apocalyptic number.

12867391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12867391 is an equidigital number, since it uses as much as digits as its factorization.

12867391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 12867391 is about 3587.1145785994. The cubic root of 12867391 is about 234.3312266933.

The spelling of 12867391 in words is "twelve million, eight hundred sixty-seven thousand, three hundred ninety-one".