509399 has 4 divisors (see below), whose sum is σ = 555720. Its totient is φ = 463080.

The previous prime is 509393. The next prime is 509413. The reversal of 509399 is 993905.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509393) 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 in 3 ways as a sum of consecutive naturals, for example, 23144 + ... + 23165.

It is an arithmetic number, because the mean of its divisors is an integer number (138930).

2⁵⁰⁹³⁹⁹ is an apocalyptic number.

509399 is a deficient number, since it is larger than the sum of its proper divisors (46321).

509399 is a wasteful number, since it uses less digits than its factorization.

509399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46320.

The product of its (nonzero) digits is 10935, while the sum is 35.

The square root of 509399 is about 713.7219346496. The cubic root of 509399 is about 79.8643012031.

It can be divided in two parts, 50 and 9399, that added together give a palindrome (9449).

The spelling of 509399 in words is "five hundred nine thousand, three hundred ninety-nine".