520987 has 8 divisors (see below), whose sum is σ = 543312. Its totient is φ = 499200.

The previous prime is 520981. The next prime is 521009. The reversal of 520987 is 789025.

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-520987 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3912 + ... + 4042.

It is an arithmetic number, because the mean of its divisors is an integer number (67914).

2⁵²⁰⁹⁸⁷ is an apocalyptic number.

520987 is a deficient number, since it is larger than the sum of its proper divisors (22325).

520987 is a wasteful number, since it uses less digits than its factorization.

520987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 520987 is about 721.7942920251. The cubic root of 520987 is about 80.4653606610.

The spelling of 520987 in words is "five hundred twenty thousand, nine hundred eighty-seven".