43565 has 4 divisors (see below), whose sum is σ = 52284. Its totient is φ = 34848.

The previous prime is 43543. The next prime is 43573. The reversal of 43565 is 56534.

43565 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 31684 + 11881 = 178^2 + 109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43565 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43565.

It is a congruent number.

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, 4352 + ... + 4361.

It is an arithmetic number, because the mean of its divisors is an integer number (13071).

2⁴³⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

43565 is a deficient number, since it is larger than the sum of its proper divisors (8719).

43565 is an equidigital number, since it uses as much as digits as its factorization.

43565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8718.

The product of its digits is 1800, while the sum is 23.

The square root of 43565 is about 208.7223035519. The cubic root of 43565 is about 35.1867568123.

The spelling of 43565 in words is "forty-three thousand, five hundred sixty-five".