9439 has 2 divisors, whose sum is σ = 9440.
Its totient is φ = 9438.
The previous prime is 9437. The next prime is 9461. The reversal of 9439 is 9349.
It is a weak prime.
It is an emirp because it is prime and its reverse (9349) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 9439 - 21 = 9437 is a prime.
Together with 9437, it forms a pair of twin primes.
It is a plaindrome in base 8, base 12 and base 16.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (9431) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4719 + 4720.
It is an arithmetic number, because the mean of its divisors is an integer number (4720).
29439 is an apocalyptic number.
9439 is a deficient number, since it is larger than the sum of its proper divisors (1).
9439 is an equidigital number, since it uses as much as digits as its factorization.
9439 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 972, while the sum is 25.
The square root of 9439 is about 97.1545161071.
The cubic root of 9439 is about 21.1336898064.
The spelling of 9439 in words is "nine thousand, four hundred thirty-nine".