520403345 has 16 divisors (see below), whose sum is σ = 778578048. Its totient is φ = 324407040.

The previous prime is 520403341. The next prime is 520403419. The reversal of 520403345 is 543304025.

520403345 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 520403345 - 2² = 520403341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520403341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675464 + ... + 676233.

It is an arithmetic number, because the mean of its divisors is an integer number (48661128).

Almost surely, 2^520403345 is an apocalyptic number.

520403345 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

520403345 is a deficient number, since it is larger than the sum of its proper divisors (258174703).

520403345 is a wasteful number, since it uses less digits than its factorization.

520403345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351720.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 520403345 is about 22812.3507118403. The cubic root of 520403345 is about 804.3530133208.

The spelling of 520403345 in words is "five hundred twenty million, four hundred three thousand, three hundred forty-five".