520657 has 8 divisors (see below), whose sum is σ = 557600. Its totient is φ = 484704.

The previous prime is 520649. The next prime is 520679. The reversal of 520657 is 756025.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 520657 - 2³ = 520649 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 1069 + ... + 1477.

It is an arithmetic number, because the mean of its divisors is an integer number (69700).

2⁵²⁰⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

520657 is a deficient number, since it is larger than the sum of its proper divisors (36943).

520657 is a wasteful number, since it uses less digits than its factorization.

520657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 520657 is about 721.5656588281. The cubic root of 520657 is about 80.4483678010.

It can be divided in two parts, 5 and 20657, that multiplied together give a triangular number (103285 = T₄₅₄).

The spelling of 520657 in words is "five hundred twenty thousand, six hundred fifty-seven".