43857 has 12 divisors (see below), whose sum is σ = 69264. Its totient is φ = 26520.

The previous prime is 43853. The next prime is 43867. The reversal of 43857 is 75834.

43857 is nontrivially palindromic in base 8.

43857 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 43857 - 2² = 43853 is a prime.

43857 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 43857.

It is not an unprimeable number, because it can be changed into a prime (43853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123 + ... + 320.

It is an arithmetic number, because the mean of its divisors is an integer number (5772).

2⁴³⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

43857 is a deficient number, since it is larger than the sum of its proper divisors (25407).

43857 is a wasteful number, since it uses less digits than its factorization.

43857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 457 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 43857 is about 209.4206293563. The cubic root of 43857 is about 35.2651964054.

It can be divided in two parts, 43 and 857, that added together give a square (900 = 30²).

The spelling of 43857 in words is "forty-three thousand, eight hundred fifty-seven".