520240404 has 48 divisors (see below), whose sum is σ = 1274370048. Its totient is φ = 164865888.

The previous prime is 520240393. The next prime is 520240411. The reversal of 520240404 is 404042025.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 40449 + ... + 51735.

It is an arithmetic number, because the mean of its divisors is an integer number (26549376).

Almost surely, 2^520240404 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 520240404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637185024).

520240404 is an abundant number, since it is smaller than the sum of its proper divisors (754129644).

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

520240404 is a wasteful number, since it uses less digits than its factorization.

520240404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11484 (or 11482 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 520240404 is about 22808.7790992854. The cubic root of 520240404 is about 804.2690555173.

Adding to 520240404 its reverse (404042025), we get a palindrome (924282429).

The spelling of 520240404 in words is "five hundred twenty million, two hundred forty thousand, four hundred four".