13866389 has 2 divisors, whose sum is σ = 13866390. Its totient is φ = 13866388.

The previous prime is 13866367. The next prime is 13866421. The reversal of 13866389 is 98366831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 1085764 = 3575^2 + 1042^2 .

It is a cyclic number.

It is not a de Polignac number, because 13866389 - 2⁸ = 13866133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13866319) 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, 6933194 + 6933195.

It is an arithmetic number, because the mean of its divisors is an integer number (6933195).

Almost surely, 2^13866389 is an apocalyptic number.

It is an amenable number.

13866389 is a deficient number, since it is larger than the sum of its proper divisors (1).

13866389 is an equidigital number, since it uses as much as digits as its factorization.

13866389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 13866389 is about 3723.7600620878. The cubic root of 13866389 is about 240.2450564085.

The spelling of 13866389 in words is "thirteen million, eight hundred sixty-six thousand, three hundred eighty-nine".