9966823 has 2 divisors, whose sum is σ = 9966824. Its totient is φ = 9966822.

The previous prime is 9966799. The next prime is 9966829. The reversal of 9966823 is 3286699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9966823 - 2⁵ = 9966791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9966823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9966829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983411 + 4983412.

It is an arithmetic number, because the mean of its divisors is an integer number (4983412).

Almost surely, 2^9966823 is an apocalyptic number.

9966823 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966823 is an equidigital number, since it uses as much as digits as its factorization.

9966823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 9966823 is about 3157.0275576878. The cubic root of 9966823 is about 215.2049460935.

The spelling of 9966823 in words is "nine million, nine hundred sixty-six thousand, eight hundred twenty-three".