520739 has 4 divisors (see below), whose sum is σ = 526680. Its totient is φ = 514800.

The previous prime is 520721. The next prime is 520747. The reversal of 520739 is 937025.

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 520739 - 2¹² = 516643 is a prime.

It is a super-2 number, since 2×520739² = 542338212242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520759) 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 3 ways as a sum of consecutive naturals, for example, 2837 + ... + 3014.

It is an arithmetic number, because the mean of its divisors is an integer number (131670).

2⁵²⁰⁷³⁹ is an apocalyptic number.

520739 is a deficient number, since it is larger than the sum of its proper divisors (5941).

520739 is an equidigital number, since it uses as much as digits as its factorization.

520739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 520739 is about 721.6224774770. The cubic root of 520739 is about 80.4525909395.

The spelling of 520739 in words is "five hundred twenty thousand, seven hundred thirty-nine".