43685 has 4 divisors (see below), whose sum is σ = 52428. Its totient is φ = 34944.

The previous prime is 43669. The next prime is 43691. The reversal of 43685 is 58634.

43685 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.

It can be written as a sum of positive squares in 2 ways, for example, as 16129 + 27556 = 127^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 43685 - 2⁴ = 43669 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 43685.

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, 4364 + ... + 4373.

It is an arithmetic number, because the mean of its divisors is an integer number (13107).

2⁴³⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

43685 is a deficient number, since it is larger than the sum of its proper divisors (8743).

43685 is an equidigital number, since it uses as much as digits as its factorization.

43685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8742.

The product of its digits is 2880, while the sum is 26.

The square root of 43685 is about 209.0095691589. The cubic root of 43685 is about 35.2190345571.

The spelling of 43685 in words is "forty-three thousand, six hundred eighty-five".