520405223 has 4 divisors (see below), whose sum is σ = 560436408. Its totient is φ = 480374040.

The previous prime is 520405219. The next prime is 520405243. The reversal of 520405223 is 322504025.

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 520405223 - 2² = 520405219 is a prime.

It is a super-2 number, since 2×520405223² = 541643192251359458, 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 (520405243) 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, 20015573 + ... + 20015598.

It is an arithmetic number, because the mean of its divisors is an integer number (140109102).

Almost surely, 2^520405223 is an apocalyptic number.

520405223 is a deficient number, since it is larger than the sum of its proper divisors (40031185).

520405223 is a wasteful number, since it uses less digits than its factorization.

520405223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40031184.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 520405223 is about 22812.3918737164. The cubic root of 520405223 is about 804.3539808865.

Adding to 520405223 its reverse (322504025), we get a palindrome (842909248).

The spelling of 520405223 in words is "five hundred twenty million, four hundred five thousand, two hundred twenty-three".