520305943 has 4 divisors (see below), whose sum is σ = 523498168. Its totient is φ = 517113720.

The previous prime is 520305917. The next prime is 520305983. The reversal of 520305943 is 349503025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520305943 - 2⁵ = 520305911 is a prime.

It is a super-2 number, since 2×520305943² = 541436548642238498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520305983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595868 + ... + 1596193.

It is an arithmetic number, because the mean of its divisors is an integer number (130874542).

Almost surely, 2^520305943 is an apocalyptic number.

520305943 is a deficient number, since it is larger than the sum of its proper divisors (3192225).

520305943 is a wasteful number, since it uses less digits than its factorization.

520305943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3192224.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 520305943 is about 22810.2157596109. The cubic root of 520305943 is about 804.3028275810.

Adding to 520305943 its reverse (349503025), we get a palindrome (869808968).

The spelling of 520305943 in words is "five hundred twenty million, three hundred five thousand, nine hundred forty-three".