509399959 has 8 divisors (see below), whose sum is σ = 528769728. Its totient is φ = 490385760.

The previous prime is 509399909. The next prime is 509399971. The reversal of 509399959 is 959993905.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 509399959 - 2¹⁵ = 509367191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509399909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85972 + ... + 91705.

It is an arithmetic number, because the mean of its divisors is an integer number (66096216).

Almost surely, 2^509399959 is an apocalyptic number.

509399959 is a deficient number, since it is larger than the sum of its proper divisors (19369769).

509399959 is a wasteful number, since it uses less digits than its factorization.

509399959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177785.

The product of its (nonzero) digits is 4428675, while the sum is 58.

The square root of 509399959 is about 22569.8905402751. The cubic root of 509399959 is about 798.6435132087.

The spelling of 509399959 in words is "five hundred nine million, three hundred ninety-nine thousand, nine hundred fifty-nine".