6423 has 4 divisors (see below), whose sum is σ = 8568. Its totient is φ = 4280.

The previous prime is 6421. The next prime is 6427. The reversal of 6423 is 3246.

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 6423 - 2¹ = 6421 is a prime.

It is a d-powerful number, because it can be written as 6² + 2¹¹ + 4⁶ + 3⁵ .

It is a D-number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068 + ... + 1073.

It is an arithmetic number, because the mean of its divisors is an integer number (2142).

6423 is a deficient number, since it is larger than the sum of its proper divisors (2145).

6423 is a wasteful number, since it uses less digits than its factorization.

6423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144.

The product of its digits is 144, while the sum is 15.

The square root of 6423 is about 80.1436210812. The cubic root of 6423 is about 18.5885696912.

Adding to 6423 its reverse (3246), we get a palindrome (9669).

The spelling of 6423 in words is "six thousand, four hundred twenty-three".