43861 has 4 divisors (see below), whose sum is σ = 45792. Its totient is φ = 41932.

The previous prime is 43853. The next prime is 43867. The reversal of 43861 is 16834.

It is the 86-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43861 - 2³ = 43853 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931 + ... + 976.

It is an arithmetic number, because the mean of its divisors is an integer number (11448).

2⁴³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

43861 is a deficient number, since it is larger than the sum of its proper divisors (1931).

43861 is a wasteful number, since it uses less digits than its factorization.

43861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930.

The product of its digits is 576, while the sum is 22.

The square root of 43861 is about 209.4301792961. The cubic root of 43861 is about 35.2662684996.

The spelling of 43861 in words is "forty-three thousand, eight hundred sixty-one".