520009 has 4 divisors (see below), whose sum is σ = 594304. Its totient is φ = 445716.

The previous prime is 519997. The next prime is 520019. The reversal of 520009 is 900025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520009 - 2⁷ = 519881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 519974 and 520001.

It is not an unprimeable number, because it can be changed into a prime (520019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37137 + ... + 37150.

It is an arithmetic number, because the mean of its divisors is an integer number (148576).

2⁵²⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

520009 is a deficient number, since it is larger than the sum of its proper divisors (74295).

520009 is an equidigital number, since it uses as much as digits as its factorization.

520009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74294.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 520009 is about 721.1164954430. The cubic root of 520009 is about 80.4149790990.

Adding to 520009 its sum of digits (16), we get a palindrome (520025).

The spelling of 520009 in words is "five hundred twenty thousand, nine".