9855823 has 2 divisors, whose sum is σ = 9855824. Its totient is φ = 9855822.

The previous prime is 9855821. The next prime is 9855863. The reversal of 9855823 is 3285589.

It is an a-pointer prime, because the next prime (9855863) can be obtained adding 9855823 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9855823 - 2¹ = 9855821 is a prime.

Together with 9855821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9855821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927911 + 4927912.

It is an arithmetic number, because the mean of its divisors is an integer number (4927912).

Almost surely, 2^9855823 is an apocalyptic number.

9855823 is a deficient number, since it is larger than the sum of its proper divisors (1).

9855823 is an equidigital number, since it uses as much as digits as its factorization.

9855823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 9855823 is about 3139.3985092689. The cubic root of 9855823 is about 214.4030529634.

The spelling of 9855823 in words is "nine million, eight hundred fifty-five thousand, eight hundred twenty-three".