520830 has 40 divisors (see below), whose sum is σ = 1402632. Its totient is φ = 138672.

The previous prime is 520813. The next prime is 520837. The reversal of 520830 is 38025.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 520830.

It is not an unprimeable number, because it can be changed into a prime (520837) by changing a digit.

520830 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 489 + ... + 1131.

2⁵²⁰⁸³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701316).

520830 is an abundant number, since it is smaller than the sum of its proper divisors (881802).

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

520830 is a wasteful number, since it uses less digits than its factorization.

520830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 520830 is about 721.6855270823. The cubic root of 520830 is about 80.4572770742.

Adding to 520830 its reverse (38025), we get a palindrome (558855).

The spelling of 520830 in words is "five hundred twenty thousand, eight hundred thirty".