423823 has 2 divisors, whose sum is σ = 423824. Its totient is φ = 423822.

The previous prime is 423803. The next prime is 423847. The reversal of 423823 is 328324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423823 - 2⁵ = 423791 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 423794 and 423803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423803) 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, 211911 + 211912.

It is an arithmetic number, because the mean of its divisors is an integer number (211912).

2⁴²³⁸²³ is an apocalyptic number.

423823 is a deficient number, since it is larger than the sum of its proper divisors (1).

423823 is an equidigital number, since it uses as much as digits as its factorization.

423823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 423823 is about 651.0168968621. The cubic root of 423823 is about 75.1152598153.

Subtracting from 423823 its sum of digits (22), we obtain a square (423801 = 651²).

The spelling of 423823 in words is "four hundred twenty-three thousand, eight hundred twenty-three".