509849 has 4 divisors (see below), whose sum is σ = 527460. Its totient is φ = 492240.

The previous prime is 509843. The next prime is 509863. The reversal of 509849 is 948905.

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 196249 + 313600 = 443^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 509849 - 2⁴ = 509833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (509843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8762 + ... + 8819.

It is an arithmetic number, because the mean of its divisors is an integer number (131865).

2⁵⁰⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

509849 is a deficient number, since it is larger than the sum of its proper divisors (17611).

509849 is a wasteful number, since it uses less digits than its factorization.

509849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17610.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 509849 is about 714.0371138813. The cubic root of 509849 is about 79.8878114953.

The spelling of 509849 in words is "five hundred nine thousand, eight hundred forty-nine".