439823 has 2 divisors, whose sum is σ = 439824. Its totient is φ = 439822.

The previous prime is 439811. The next prime is 439849. The reversal of 439823 is 328934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 439823 - 2⁶ = 439759 is a prime.

It is a super-4 number, since 4×439823⁴ (a number of 24 digits) contains 4444 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 4⁹ + 3 + 8 + 9 + 2⁹ + 3¹¹ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439853) 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, 219911 + 219912.

It is an arithmetic number, because the mean of its divisors is an integer number (219912).

2⁴³⁹⁸²³ is an apocalyptic number.

439823 is a deficient number, since it is larger than the sum of its proper divisors (1).

439823 is an equidigital number, since it uses as much as digits as its factorization.

439823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 439823 is about 663.1915258807. The cubic root of 439823 is about 76.0488490203.

Subtracting from 439823 its reverse (328934), we obtain a square (110889 = 333²).

The spelling of 439823 in words is "four hundred thirty-nine thousand, eight hundred twenty-three".