520685 has 8 divisors (see below), whose sum is σ = 681696. Its totient is φ = 378640.

The previous prime is 520679. The next prime is 520691. The reversal of 520685 is 586025.

It is an interprime number because it is at equal distance from previous prime (520679) and next prime (520691).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520685 - 2⁶ = 520621 is a prime.

It is a super-2 number, since 2×520685² = 542225738450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4679 + ... + 4788.

It is an arithmetic number, because the mean of its divisors is an integer number (85212).

2⁵²⁰⁶⁸⁵ is an apocalyptic number.

520685 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

520685 is a deficient number, since it is larger than the sum of its proper divisors (161011).

520685 is a wasteful number, since it uses less digits than its factorization.

520685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9483.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 520685 is about 721.5850608210. The cubic root of 520685 is about 80.4498098981.

The spelling of 520685 in words is "five hundred twenty thousand, six hundred eighty-five".