13685443 has 4 divisors (see below), whose sum is σ = 13693680. Its totient is φ = 13677208.

The previous prime is 13685423. The next prime is 13685461. The reversal of 13685443 is 34458631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34458631 = 269 ⋅128099.

It is a cyclic number.

It is not a de Polignac number, because 13685443 - 2¹⁷ = 13554371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13685399 and 13685408.

It is not an unprimeable number, because it can be changed into a prime (13685423) by changing a digit.

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, 655 + ... + 5272.

It is an arithmetic number, because the mean of its divisors is an integer number (3423420).

Almost surely, 2^13685443 is an apocalyptic number.

13685443 is a deficient number, since it is larger than the sum of its proper divisors (8237).

13685443 is an equidigital number, since it uses as much as digits as its factorization.

13685443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8236.

The product of its digits is 34560, while the sum is 34.

The square root of 13685443 is about 3699.3841379343. The cubic root of 13685443 is about 239.1954715813.

The spelling of 13685443 in words is "thirteen million, six hundred eighty-five thousand, four hundred forty-three".