509885 has 4 divisors (see below), whose sum is σ = 611868. Its totient is φ = 407904.

The previous prime is 509879. The next prime is 509909. The reversal of 509885 is 588905.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 395641 = 338^2 + 629^2 .

It is a cyclic number.

It is not a de Polignac number, because 509885 - 2¹⁶ = 444349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50984 + ... + 50993.

It is an arithmetic number, because the mean of its divisors is an integer number (152967).

2⁵⁰⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

509885 is a deficient number, since it is larger than the sum of its proper divisors (101983).

509885 is a wasteful number, since it uses less digits than its factorization.

509885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101982.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 509885 is about 714.0623222100. The cubic root of 509885 is about 79.8896917210.

The spelling of 509885 in words is "five hundred nine thousand, eight hundred eighty-five".