520421443 has 4 divisors (see below), whose sum is σ = 538367040. Its totient is φ = 502475848.

The previous prime is 520421441. The next prime is 520421449. The reversal of 520421443 is 344124025.

It is a happy number.

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 520421443 - 2¹ = 520421441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520421441) 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, 8972755 + ... + 8972812.

It is an arithmetic number, because the mean of its divisors is an integer number (134591760).

Almost surely, 2^520421443 is an apocalyptic number.

520421443 is a deficient number, since it is larger than the sum of its proper divisors (17945597).

520421443 is a wasteful number, since it uses less digits than its factorization.

520421443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17945596.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 520421443 is about 22812.7473794806. The cubic root of 520421443 is about 804.3623375064.

Adding to 520421443 its reverse (344124025), we get a palindrome (864545468).

The spelling of 520421443 in words is "five hundred twenty million, four hundred twenty-one thousand, four hundred forty-three".