520240 has 40 divisors (see below), whose sum is σ = 1383840. Its totient is φ = 178176.

The previous prime is 520213. The next prime is 520241. The reversal of 520240 is 42025.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×520240³ = 422408333609472000, which contains 333 as substring.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 520240.

It is not an unprimeable number, because it can be changed into a prime (520241) by changing a digit.

520240 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 7 ways as a sum of consecutive naturals, for example, 96 + ... + 1024.

It is an arithmetic number, because the mean of its divisors is an integer number (34596).

2⁵²⁰²⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (691920).

520240 is an abundant number, since it is smaller than the sum of its proper divisors (863600).

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

520240 is a wasteful number, since it uses less digits than its factorization.

520240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 520240 is about 721.2766459549. The cubic root of 520240 is about 80.4268847328.

Adding to 520240 its reverse (42025), we get a palindrome (562265).

The spelling of 520240 in words is "five hundred twenty thousand, two hundred forty".