13865729 has 2 divisors, whose sum is σ = 13865730. Its totient is φ = 13865728.

The previous prime is 13865707. The next prime is 13865759. The reversal of 13865729 is 92756831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13126129 + 739600 = 3623^2 + 860^2 .

It is an emirp because it is prime and its reverse (92756831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13865729 - 2⁸ = 13865473 is a prime.

It is not a weakly prime, because it can be changed into another prime (13865759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6932864 + 6932865.

It is an arithmetic number, because the mean of its divisors is an integer number (6932865).

Almost surely, 2^13865729 is an apocalyptic number.

It is an amenable number.

13865729 is a deficient number, since it is larger than the sum of its proper divisors (1).

13865729 is an equidigital number, since it uses as much as digits as its factorization.

13865729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 13865729 is about 3723.6714409303. The cubic root of 13865729 is about 240.2412446914.

The spelling of 13865729 in words is "thirteen million, eight hundred sixty-five thousand, seven hundred twenty-nine".