520540 has 24 divisors (see below), whose sum is σ = 1158192. Its totient is φ = 195840.

The previous prime is 520529. The next prime is 520547. The reversal of 520540 is 45025.

It is a happy number.

520540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

520540 is a modest number, since divided by 540 gives 520 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426 + ... + 1105.

It is an arithmetic number, because the mean of its divisors is an integer number (48258).

2⁵²⁰⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

520540 is an abundant number, since it is smaller than the sum of its proper divisors (637652).

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

520540 is a wasteful number, since it uses less digits than its factorization.

520540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1555 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 520540 is about 721.4845805698. The cubic root of 520540 is about 80.4423413356.

Adding to 520540 its reverse (45025), we get a palindrome (565565).

The spelling of 520540 in words is "five hundred twenty thousand, five hundred forty".