6399823 has 4 divisors (see below), whose sum is σ = 6409288. Its totient is φ = 6390360.

The previous prime is 6399821. The next prime is 6399829. The reversal of 6399823 is 3289936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6399823 - 2¹ = 6399821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399821) 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 in 3 ways as a sum of consecutive naturals, for example, 3633 + ... + 5098.

It is an arithmetic number, because the mean of its divisors is an integer number (1602322).

Almost surely, 2^6399823 is an apocalyptic number.

6399823 is a deficient number, since it is larger than the sum of its proper divisors (9465).

6399823 is an equidigital number, since it uses as much as digits as its factorization.

6399823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9464.

The product of its digits is 69984, while the sum is 40.

The square root of 6399823 is about 2529.7871451962. The cubic root of 6399823 is about 185.6618417428.

The spelling of 6399823 in words is "six million, three hundred ninety-nine thousand, eight hundred twenty-three".