84389 has 2 divisors, whose sum is σ = 84390.
Its totient is φ = 84388.
The previous prime is 84377. The next prime is 84391. The reversal of 84389 is 98348.
Subtracting from 84389 its product of digits (6912), we obtain a palindrome (77477).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 84100 + 289 = 290^2 + 17^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-84389 is a prime.
Together with 84391, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (84319) 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, 42194 + 42195.
It is an arithmetic number, because the mean of its divisors is an integer number (42195).
284389 is an apocalyptic number.
It is an amenable number.
84389 is a deficient number, since it is larger than the sum of its proper divisors (1).
84389 is an equidigital number, since it uses as much as digits as its factorization.
84389 is an evil number, because the sum of its binary digits is even.
The product of its digits is 6912, while the sum is 32.
The square root of 84389 is about 290.4978485290.
The cubic root of 84389 is about 43.8626917908.
The spelling of 84389 in words is "eighty-four thousand, three hundred eighty-nine".