13887865 has 4 divisors (see below), whose sum is σ = 16665444. Its totient is φ = 11110288.

The previous prime is 13887859. The next prime is 13887869. The reversal of 13887865 is 56878831.

13887865 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 8185321 + 5702544 = 2861^2 + 2388^2 .

It is a cyclic number.

It is not a de Polignac number, because 13887865 - 2³ = 13887857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13887869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388782 + ... + 1388791.

It is an arithmetic number, because the mean of its divisors is an integer number (4166361).

Almost surely, 2^13887865 is an apocalyptic number.

It is an amenable number.

13887865 is a deficient number, since it is larger than the sum of its proper divisors (2777579).

13887865 is an equidigital number, since it uses as much as digits as its factorization.

13887865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777578.

The product of its digits is 322560, while the sum is 46.

The square root of 13887865 is about 3726.6425908584. The cubic root of 13887865 is about 240.3690214262.

It can be divided in two parts, 1 and 3887865, that added together give a triangular number (3887866 = T₂₇₈₈).

The spelling of 13887865 in words is "thirteen million, eight hundred eighty-seven thousand, eight hundred sixty-five".