509239 has 2 divisors, whose sum is σ = 509240. Its totient is φ = 509238.

The previous prime is 509227. The next prime is 509263. The reversal of 509239 is 932905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509239 - 2⁹ = 508727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254619 + 254620.

It is an arithmetic number, because the mean of its divisors is an integer number (254620).

2⁵⁰⁹²³⁹ is an apocalyptic number.

509239 is a deficient number, since it is larger than the sum of its proper divisors (1).

509239 is an equidigital number, since it uses as much as digits as its factorization.

509239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 509239 is about 713.6098373761. The cubic root of 509239 is about 79.8559386515.

The spelling of 509239 in words is "five hundred nine thousand, two hundred thirty-nine".