520405212 has 48 divisors (see below), whose sum is σ = 1280854400. Its totient is φ = 163995840.

The previous prime is 520405189. The next prime is 520405219. The reversal of 520405212 is 212504025.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520405219) 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 15 ways as a sum of consecutive naturals, for example, 121239 + ... + 125457.

Almost surely, 2^520405212 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 520405212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (640427200).

520405212 is an abundant number, since it is smaller than the sum of its proper divisors (760449188).

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

520405212 is a wasteful number, since it uses less digits than its factorization.

520405212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786 (or 4784 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 520405212 is about 22812.3916326193. The cubic root of 520405212 is about 804.3539752191.

Adding to 520405212 its reverse (212504025), we get a palindrome (732909237).

The spelling of 520405212 in words is "five hundred twenty million, four hundred five thousand, two hundred twelve".