509879 has 2 divisors, whose sum is σ = 509880. Its totient is φ = 509878.

The previous prime is 509867. The next prime is 509909. The reversal of 509879 is 978905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509879 - 2⁴ = 509863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (503879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254939 + 254940.

It is an arithmetic number, because the mean of its divisors is an integer number (254940).

2⁵⁰⁹⁸⁷⁹ is an apocalyptic number.

509879 is a deficient number, since it is larger than the sum of its proper divisors (1).

509879 is an equidigital number, since it uses as much as digits as its factorization.

509879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 509879 is about 714.0581208837. The cubic root of 509879 is about 79.8893783562.

The spelling of 509879 in words is "five hundred nine thousand, eight hundred seventy-nine".