520432440 has 256 divisors, whose sum is σ = 1785991680. Its totient is φ = 120207360.

The previous prime is 520432427. The next prime is 520432447. The reversal of 520432440 is 44234025.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 520432440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520432447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3008194 + ... + 3008366.

It is an arithmetic number, because the mean of its divisors is an integer number (6976530).

Almost surely, 2^520432440 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 520432440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892995840).

520432440 is an abundant number, since it is smaller than the sum of its proper divisors (1265559240).

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

520432440 is a wasteful number, since it uses less digits than its factorization.

520432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 520432440 is about 22812.9884057306. The cubic root of 520432440 is about 804.3680031136.

Adding to 520432440 its reverse (44234025), we get a palindrome (564666465).

The spelling of 520432440 in words is "five hundred twenty million, four hundred thirty-two thousand, four hundred forty".