12886381 has 2 divisors, whose sum is σ = 12886382. Its totient is φ = 12886380.

The previous prime is 12886343. The next prime is 12886439. The reversal of 12886381 is 18368821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 1121481 = 3430^2 + 1059^2 .

It is an emirp because it is prime and its reverse (18368821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12886381 - 2⁷ = 12886253 is a prime.

It is a super-2 number, since 2×12886381² = 332117630554322, which contains 22 as substring.

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 12886381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12886301) 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, 6443190 + 6443191.

It is an arithmetic number, because the mean of its divisors is an integer number (6443191).

Almost surely, 2^12886381 is an apocalyptic number.

It is an amenable number.

12886381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12886381 is an equidigital number, since it uses as much as digits as its factorization.

12886381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 12886381 is about 3589.7605769745. The cubic root of 12886381 is about 234.4464472192.

The spelling of 12886381 in words is "twelve million, eight hundred eighty-six thousand, three hundred eighty-one".