540823 has 2 divisors, whose sum is σ = 540824. Its totient is φ = 540822.

The previous prime is 540809. The next prime is 540851. The reversal of 540823 is 328045.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540823 is a prime.

540823 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 540794 and 540803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (540803) 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 as a sum of consecutive naturals, namely, 270411 + 270412.

It is an arithmetic number, because the mean of its divisors is an integer number (270412).

2⁵⁴⁰⁸²³ is an apocalyptic number.

540823 is a deficient number, since it is larger than the sum of its proper divisors (1).

540823 is an equidigital number, since it uses as much as digits as its factorization.

540823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 540823 is about 735.4066902062. The cubic root of 540823 is about 81.4738772339.

Adding to 540823 its reverse (328045), we get a palindrome (868868).

The spelling of 540823 in words is "five hundred forty thousand, eight hundred twenty-three".