43845 has 16 divisors (see below), whose sum is σ = 72960. Its totient is φ = 22464.

The previous prime is 43801. The next prime is 43853. The reversal of 43845 is 54834.

43845 = T₂₉ + T₃₀ + ... + T₆₅.

It is a happy number.

43845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43845 - 2⁶ = 43781 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516 + ... + 594.

It is an arithmetic number, because the mean of its divisors is an integer number (4560).

2⁴³⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

43845 is a deficient number, since it is larger than the sum of its proper divisors (29115).

43845 is a wasteful number, since it uses less digits than its factorization.

43845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124.

The product of its digits is 1920, while the sum is 24.

The square root of 43845 is about 209.3919769237. The cubic root of 43845 is about 35.2619797319.

It can be divided in two parts, 43 and 845, that added together give a palindrome (888).

The spelling of 43845 in words is "forty-three thousand, eight hundred forty-five".