520018 has 4 divisors (see below), whose sum is σ = 780030. Its totient is φ = 260008.

The previous prime is 519997. The next prime is 520019. The reversal of 520018 is 810025.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 514089 + 5929 = 717^2 + 77^2 .

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 519983 and 520010.

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

520018 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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130003 + ... + 130006.

2⁵²⁰⁰¹⁸ is an apocalyptic number.

520018 is a deficient number, since it is larger than the sum of its proper divisors (260012).

520018 is a wasteful number, since it uses less digits than its factorization.

520018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260011.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 520018 is about 721.1227357392. The cubic root of 520018 is about 80.4154430209.

The spelling of 520018 in words is "five hundred twenty thousand, eighteen".