9859 has 2 divisors, whose sum is σ = 9860. Its totient is φ = 9858.
The previous prime is 9857. The next prime is 9871. The reversal of 9859 is 9589.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 9859 - 21 = 9857 is a prime.
Together with 9857, it forms a pair of twin primes.
It is a self number, because there is not a number n which added to its sum of digits gives 9859.
It is not a weakly prime, because it can be changed into another prime (9851) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4929 + 4930.
It is an arithmetic number, because the mean of its divisors is an integer number (4930).
29859 is an apocalyptic number.
9859 is a deficient number, since it is larger than the sum of its proper divisors (1).
9859 is an equidigital number, since it uses as much as digits as its factorization.
9859 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3240, while the sum is 31.
The square root of 9859 is about 99.2924971989. The cubic root of 9859 is about 21.4426087919.
It can be divided in two parts, 9 and 859, that added together give a palindrome (868).
The spelling of 9859 in words is "nine thousand, eight hundred fifty-nine".
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