6439823 has 4 divisors (see below), whose sum is σ = 6935208. Its totient is φ = 5944440.

The previous prime is 6439819. The next prime is 6439837. The reversal of 6439823 is 3289346.

It is a happy number.

6439823 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3289346 = 2 ⋅1644673.

It is a cyclic number.

It is not a de Polignac number, because 6439823 - 2² = 6439819 is a prime.

It is a d-powerful number, because it can be written as 6⁵ + 4⁴ + 3⁹ + 9⁷ + 8⁵ + 2¹¹ + 3¹³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439123) 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 in 3 ways as a sum of consecutive naturals, for example, 247673 + ... + 247698.

It is an arithmetic number, because the mean of its divisors is an integer number (1733802).

Almost surely, 2^6439823 is an apocalyptic number.

6439823 is a deficient number, since it is larger than the sum of its proper divisors (495385).

6439823 is a wasteful number, since it uses less digits than its factorization.

6439823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495384.

The product of its digits is 31104, while the sum is 35.

The square root of 6439823 is about 2537.6806339648. The cubic root of 6439823 is about 186.0478448622.

The spelling of 6439823 in words is "six million, four hundred thirty-nine thousand, eight hundred twenty-three".