520439 has 4 divisors (see below), whose sum is σ = 529320. Its totient is φ = 511560.

The previous prime is 520433. The next prime is 520447. The reversal of 520439 is 934025.

520439 is nontrivially palindromic in base 16.

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 520439 - 2⁴ = 520423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520433) 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, 4352 + ... + 4469.

It is an arithmetic number, because the mean of its divisors is an integer number (132330).

2⁵²⁰⁴³⁹ is an apocalyptic number.

520439 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

520439 is a deficient number, since it is larger than the sum of its proper divisors (8881).

520439 is an equidigital number, since it uses as much as digits as its factorization.

520439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 520439 is about 721.4145826084. The cubic root of 520439 is about 80.4371382759.

It can be divided in two parts, 520 and 439, that added together give a palindrome (959).

The spelling of 520439 in words is "five hundred twenty thousand, four hundred thirty-nine".