518820 has 24 divisors (see below), whose sum is σ = 1452864. Its totient is φ = 138336.

The previous prime is 518813. The next prime is 518831. The reversal of 518820 is 28815.

It is an unprimeable number.

518820 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4264 + ... + 4383.

It is an arithmetic number, because the mean of its divisors is an integer number (60536).

2⁵¹⁸⁸²⁰ is an apocalyptic number.

It is an amenable number.

518820 is an abundant number, since it is smaller than the sum of its proper divisors (934044).

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

518820 is a wasteful number, since it uses less digits than its factorization.

518820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8659 (or 8657 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 518820 is about 720.2916076146. The cubic root of 518820 is about 80.3536427400.

The spelling of 518820 in words is "five hundred eighteen thousand, eight hundred twenty".