520387 has 8 divisors (see below), whose sum is σ = 629856. Its totient is φ = 419712.

The previous prime is 520381. The next prime is 520393. The reversal of 520387 is 783025.

It is an interprime number because it is at equal distance from previous prime (520381) and next prime (520393).

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 520387 - 2³ = 520379 is a prime.

It is a Duffinian number.

520387 is a lucky number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (520381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2068 + ... + 2305.

It is an arithmetic number, because the mean of its divisors is an integer number (78732).

2⁵²⁰³⁸⁷ is an apocalyptic number.

520387 is a deficient number, since it is larger than the sum of its proper divisors (109469).

520387 is a wasteful number, since it uses less digits than its factorization.

520387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4397.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 520387 is about 721.3785414053. The cubic root of 520387 is about 80.4344592104.

The spelling of 520387 in words is "five hundred twenty thousand, three hundred eighty-seven".