520404040 has 32 divisors (see below), whose sum is σ = 1260980280. Its totient is φ = 192148992.

The previous prime is 520404029. The next prime is 520404089. The reversal of 520404040 is 40404025.

520404040 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 416404836 + 103999204 = 20406^2 + 10198^2 .

520404040 is a modest number, since divided by 404040 gives 520 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 520403999 and 520404017.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 499869 + ... + 500908.

Almost surely, 2^520404040 is an apocalyptic number.

It is an amenable number.

520404040 is an abundant number, since it is smaller than the sum of its proper divisors (740576240).

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

520404040 is a wasteful number, since it uses less digits than its factorization.

520404040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000801 (or 1000797 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 520404040 is about 22812.3659448116. The cubic root of 520404040 is about 804.3533713925.

Adding to 520404040 its reverse (40404025), we get a palindrome (560808065).

The spelling of 520404040 in words is "five hundred twenty million, four hundred four thousand, forty".