520340440 has 32 divisors (see below), whose sum is σ = 1174607280. Its totient is φ = 207453312.

The previous prime is 520340393. The next prime is 520340453. The reversal of 520340440 is 44043025.

It is a happy number.

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, 8907 + ... + 33466.

Almost surely, 2^520340440 is an apocalyptic number.

It is an amenable number.

520340440 is an abundant number, since it is smaller than the sum of its proper divisors (654266840).

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

520340440 is a wasteful number, since it uses less digits than its factorization.

520340440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42691 (or 42687 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 520340440 is about 22810.9719214241. The cubic root of 520340440 is about 804.3206026496.

Adding to 520340440 its reverse (44043025), we get a palindrome (564383465).

The spelling of 520340440 in words is "five hundred twenty million, three hundred forty thousand, four hundred forty".