540820 has 24 divisors (see below), whose sum is σ = 1298304. Its totient is φ = 185376.

The previous prime is 540809. The next prime is 540823. The reversal of 540820 is 28045.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540823) by changing a digit.

540820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1792 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (54096).

2⁵⁴⁰⁸²⁰ is an apocalyptic number.

It is an amenable number.

540820 is an abundant number, since it is smaller than the sum of its proper divisors (757484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

540820 is a wasteful number, since it uses less digits than its factorization.

540820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879 (or 3877 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 540820 is about 735.4046505156. The cubic root of 540820 is about 81.4737265857.

Adding to 540820 its reverse (28045), we get a palindrome (568865).

The spelling of 540820 in words is "five hundred forty thousand, eight hundred twenty".