12185867 has 2 divisors, whose sum is σ = 12185868. Its totient is φ = 12185866.

The previous prime is 12185863. The next prime is 12185891. The reversal of 12185867 is 76858121.

It is a weak prime.

It is an emirp because it is prime and its reverse (76858121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12185867 - 2² = 12185863 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12185867.

It is not a weakly prime, because it can be changed into another prime (12185863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6092933 + 6092934.

It is an arithmetic number, because the mean of its divisors is an integer number (6092934).

Almost surely, 2^12185867 is an apocalyptic number.

12185867 is a deficient number, since it is larger than the sum of its proper divisors (1).

12185867 is an equidigital number, since it uses as much as digits as its factorization.

12185867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 38.

The square root of 12185867 is about 3490.8261199894. The cubic root of 12185867 is about 230.1188232907.

The spelling of 12185867 in words is "twelve million, one hundred eighty-five thousand, eight hundred sixty-seven".