13687385 has 4 divisors (see below), whose sum is σ = 16424868. Its totient is φ = 10949904.

The previous prime is 13687357. The next prime is 13687403. The reversal of 13687385 is 58378631.

13687385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58378631 = 83 ⋅703357.

It can be written as a sum of positive squares in 2 ways, for example, as 2343961 + 11343424 = 1531^2 + 3368^2 .

It is a cyclic number.

It is not a de Polignac number, because 13687385 - 2⁶ = 13687321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1368734 + ... + 1368743.

It is an arithmetic number, because the mean of its divisors is an integer number (4106217).

Almost surely, 2^13687385 is an apocalyptic number.

It is an amenable number.

13687385 is a deficient number, since it is larger than the sum of its proper divisors (2737483).

13687385 is an equidigital number, since it uses as much as digits as its factorization.

13687385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737482.

The product of its digits is 120960, while the sum is 41.

The square root of 13687385 is about 3699.6466047448. The cubic root of 13687385 is about 239.2067851996.

The spelling of 13687385 in words is "thirteen million, six hundred eighty-seven thousand, three hundred eighty-five".