520391 has 8 divisors (see below), whose sum is σ = 558000. Its totient is φ = 483840.

The previous prime is 520381. The next prime is 520393. The reversal of 520391 is 193025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520391 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520393) 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, 935 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (69750).

2⁵²⁰³⁹¹ is an apocalyptic number.

520391 is a deficient number, since it is larger than the sum of its proper divisors (37609).

520391 is a wasteful number, since it uses less digits than its factorization.

520391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 520391 is about 721.3813138694. The cubic root of 520391 is about 80.4346652987.

The spelling of 520391 in words is "five hundred twenty thousand, three hundred ninety-one".