520687 has 4 divisors (see below), whose sum is σ = 532840. Its totient is φ = 508536.

The previous prime is 520679. The next prime is 520691. The reversal of 520687 is 786025.

520687 is nontrivially palindromic in base 14.

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 520687 - 2³ = 520679 is a prime.

It is a super-2 number, since 2×520687² = 542229903938, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520607) 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, 6012 + ... + 6097.

It is an arithmetic number, because the mean of its divisors is an integer number (133210).

2⁵²⁰⁶⁸⁷ is an apocalyptic number.

520687 is a deficient number, since it is larger than the sum of its proper divisors (12153).

520687 is a wasteful number, since it uses less digits than its factorization.

520687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12152.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 520687 is about 721.5864466576. The cubic root of 520687 is about 80.4499129031.

The spelling of 520687 in words is "five hundred twenty thousand, six hundred eighty-seven".