13686545 has 4 divisors (see below), whose sum is σ = 16423860. Its totient is φ = 10949232.

The previous prime is 13686529. The next prime is 13686553. The reversal of 13686545 is 54568631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54568631 = 13 ⋅4197587.

It can be written as a sum of positive squares in 2 ways, for example, as 10471696 + 3214849 = 3236^2 + 1793^2 .

It is a cyclic number.

It is not a de Polignac number, because 13686545 - 2⁴ = 13686529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13686499 and 13686508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1368650 + ... + 1368659.

It is an arithmetic number, because the mean of its divisors is an integer number (4105965).

Almost surely, 2^13686545 is an apocalyptic number.

It is an amenable number.

13686545 is a deficient number, since it is larger than the sum of its proper divisors (2737315).

13686545 is an equidigital number, since it uses as much as digits as its factorization.

13686545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737314.

The product of its digits is 86400, while the sum is 38.

The square root of 13686545 is about 3699.5330786465. The cubic root of 13686545 is about 239.2018916958.

The spelling of 13686545 in words is "thirteen million, six hundred eighty-six thousand, five hundred forty-five".