509867 has 2 divisors, whose sum is σ = 509868. Its totient is φ = 509866.

The previous prime is 509863. The next prime is 509879. The reversal of 509867 is 768905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509867 - 2² = 509863 is a prime.

It is a Chen prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 509867.

It is not a weakly prime, because it can be changed into another prime (509863) 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 as a sum of consecutive naturals, namely, 254933 + 254934.

It is an arithmetic number, because the mean of its divisors is an integer number (254934).

2⁵⁰⁹⁸⁶⁷ is an apocalyptic number.

509867 is a deficient number, since it is larger than the sum of its proper divisors (1).

509867 is an equidigital number, since it uses as much as digits as its factorization.

509867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 509867 is about 714.0497181569. The cubic root of 509867 is about 79.8887516192. Note that the first 3 decimals are identical.

The spelling of 509867 in words is "five hundred nine thousand, eight hundred sixty-seven".