520389 has 12 divisors (see below), whose sum is σ = 763776. Its totient is φ = 341352.

The previous prime is 520381. The next prime is 520393. The reversal of 520389 is 983025.

It is not a de Polignac number, because 520389 - 2³ = 520381 is a prime.

It is a super-2 number, since 2×520389² = 541609422642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 520389.

It is not an unprimeable number, because it can be changed into a prime (520381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172 + ... + 1034.

It is an arithmetic number, because the mean of its divisors is an integer number (63648).

2⁵²⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

520389 is a deficient number, since it is larger than the sum of its proper divisors (243387).

520389 is a wasteful number, since it uses less digits than its factorization.

520389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 520389 is about 721.3799276387. The cubic root of 520389 is about 80.4345622547.

It can be divided in two parts, 520 and 389, that added together give a palindrome (909).

The spelling of 520389 in words is "five hundred twenty thousand, three hundred eighty-nine".