520729 has 4 divisors (see below), whose sum is σ = 568080. Its totient is φ = 473380.

The previous prime is 520721. The next prime is 520747. The reversal of 520729 is 927025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520729 - 2³ = 520721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520721) 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, 23659 + ... + 23680.

It is an arithmetic number, because the mean of its divisors is an integer number (142020).

2⁵²⁰⁷²⁹ is an apocalyptic number.

It is an amenable number.

520729 is a deficient number, since it is larger than the sum of its proper divisors (47351).

520729 is a wasteful number, since it uses less digits than its factorization.

520729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47350.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 520729 is about 721.6155486130. The cubic root of 520729 is about 80.4520759463.

The spelling of 520729 in words is "five hundred twenty thousand, seven hundred twenty-nine".