13857691 has 2 divisors, whose sum is σ = 13857692. Its totient is φ = 13857690.

The previous prime is 13857667. The next prime is 13857719. The reversal of 13857691 is 19675831.

13857691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13857691 - 2¹⁷ = 13726619 is a prime.

It is not a weakly prime, because it can be changed into another prime (13807691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6928845 + 6928846.

It is an arithmetic number, because the mean of its divisors is an integer number (6928846).

Almost surely, 2^13857691 is an apocalyptic number.

13857691 is a deficient number, since it is larger than the sum of its proper divisors (1).

13857691 is an equidigital number, since it uses as much as digits as its factorization.

13857691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 13857691 is about 3722.5919733433. The cubic root of 13857691 is about 240.1948128884.

The spelling of 13857691 in words is "thirteen million, eight hundred fifty-seven thousand, six hundred ninety-one".