13687543 has 4 divisors (see below), whose sum is σ = 14407960. Its totient is φ = 12967128.

The previous prime is 13687529. The next prime is 13687549. The reversal of 13687543 is 34578631.

13687543 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 is a cyclic number.

It is not a de Polignac number, because 13687543 - 2⁹ = 13687031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13687549) 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, 360180 + ... + 360217.

It is an arithmetic number, because the mean of its divisors is an integer number (3601990).

Almost surely, 2^13687543 is an apocalyptic number.

13687543 is a deficient number, since it is larger than the sum of its proper divisors (720417).

13687543 is an equidigital number, since it uses as much as digits as its factorization.

13687543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720416.

The product of its digits is 60480, while the sum is 37.

The square root of 13687543 is about 3699.6679580741. The cubic root of 13687543 is about 239.2077056219.

It can be divided in two parts, 1368 and 7543, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 13687543 in words is "thirteen million, six hundred eighty-seven thousand, five hundred forty-three".