520440213 has 4 divisors (see below), whose sum is σ = 693920288. Its totient is φ = 346960140.

The previous prime is 520440181. The next prime is 520440233. The reversal of 520440213 is 312044025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 520440213 - 2⁵ = 520440181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520440213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520440233) 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, 86740033 + ... + 86740038.

It is an arithmetic number, because the mean of its divisors is an integer number (173480072).

Almost surely, 2^520440213 is an apocalyptic number.

It is an amenable number.

520440213 is a deficient number, since it is larger than the sum of its proper divisors (173480075).

520440213 is a wasteful number, since it uses less digits than its factorization.

520440213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173480074.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 520440213 is about 22813.1587685704. The cubic root of 520440213 is about 804.3720076816.

Adding to 520440213 its reverse (312044025), we get a palindrome (832484238).

The spelling of 520440213 in words is "five hundred twenty million, four hundred forty thousand, two hundred thirteen".