520857 has 16 divisors (see below), whose sum is σ = 783360. Its totient is φ = 342000.

The previous prime is 520853. The next prime is 520867. The reversal of 520857 is 758025.

It is a happy number.

It is not a de Polignac number, because 520857 - 2² = 520853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

520857 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 520857.

It is not an unprimeable number, because it can be changed into a prime (520853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2632 + ... + 2822.

It is an arithmetic number, because the mean of its divisors is an integer number (48960).

2⁵²⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

520857 is a deficient number, since it is larger than the sum of its proper divisors (262503).

520857 is a wasteful number, since it uses less digits than its factorization.

520857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 520857 is about 721.7042330484. The cubic root of 520857 is about 80.4586673608.

520857 divided by its sum of digits (27) gives a palindrome (19291).

The spelling of 520857 in words is "five hundred twenty thousand, eight hundred fifty-seven".