520509440 has 96 divisors (see below), whose sum is σ = 1362750480. Its totient is φ = 189235200.

The previous prime is 520509421. The next prime is 520509461. The reversal of 520509440 is 44905025.

It is a happy number.

It is a super-2 number, since 2×520509440² = 541860154258227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110330 + ... + 114950.

Almost surely, 2^520509440 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 520509440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (681375240).

520509440 is an abundant number, since it is smaller than the sum of its proper divisors (842241040).

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

520509440 is a wasteful number, since it uses less digits than its factorization.

520509440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659 (or 4639 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 520509440 is about 22814.6759784135. The cubic root of 520509440 is about 804.4076709469.

The spelling of 520509440 in words is "five hundred twenty million, five hundred nine thousand, four hundred forty".