520306403 has 16 divisors (see below), whose sum is σ = 569825280. Its totient is φ = 473156736.

The previous prime is 520306399. The next prime is 520306411. The reversal of 520306403 is 304603025.

It is a cyclic number.

It is not a de Polignac number, because 520306403 - 2² = 520306399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520306463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59000 + ... + 67242.

It is an arithmetic number, because the mean of its divisors is an integer number (35614080).

Almost surely, 2^520306403 is an apocalyptic number.

520306403 is a deficient number, since it is larger than the sum of its proper divisors (49518877).

520306403 is a wasteful number, since it uses less digits than its factorization.

520306403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8386.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 520306403 is about 22810.2258428101. The cubic root of 520306403 is about 804.3030646077.

Adding to 520306403 its reverse (304603025), we get a palindrome (824909428).

The spelling of 520306403 in words is "five hundred twenty million, three hundred six thousand, four hundred three".