43889 has 2 divisors, whose sum is σ = 43890.
Its totient is φ = 43888.
The previous prime is 43867. The next prime is 43891. The reversal of 43889 is 98834.
Subtracting 43889 from its reverse (98834), we obtain a palindrome (54945).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 43264 + 625 = 208^2 + 25^2
It is a cyclic number.
It is not a de Polignac number, because 43889 - 28 = 43633 is a prime.
Together with 43891, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (43189) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21944 + 21945.
It is an arithmetic number, because the mean of its divisors is an integer number (21945).
243889 is an apocalyptic number.
It is an amenable number.
43889 is a deficient number, since it is larger than the sum of its proper divisors (1).
43889 is an equidigital number, since it uses as much as digits as its factorization.
43889 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 6912, while the sum is 32.
The square root of 43889 is about 209.4970166852.
The cubic root of 43889 is about 35.2737713340.
The spelling of 43889 in words is "forty-three thousand, eight hundred eighty-nine".