520400111 has 16 divisors (see below), whose sum is σ = 649313280. Its totient is φ = 405192480.

The previous prime is 520400081. The next prime is 520400113. The reversal of 520400111 is 111004025.

It is a de Polignac number, because none of the positive numbers 2^k-520400111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520400113) 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, 176330 + ... + 179256.

It is an arithmetic number, because the mean of its divisors is an integer number (40582080).

Almost surely, 2^520400111 is an apocalyptic number.

520400111 is a deficient number, since it is larger than the sum of its proper divisors (128913169).

520400111 is a wasteful number, since it uses less digits than its factorization.

520400111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5254.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 520400111 is about 22812.2798290745. The cubic root of 520400111 is about 804.3513471241.

Adding to 520400111 its reverse (111004025), we get a palindrome (631404136).

The spelling of 520400111 in words is "five hundred twenty million, four hundred thousand, one hundred eleven".