509309439 has 8 divisors (see below), whose sum is σ = 679289520. Its totient is φ = 339434496.

The previous prime is 509309387. The next prime is 509309453. The reversal of 509309439 is 934903905.

It is a happy number.

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

It is not a de Polignac number, because 509309439 - 2¹² = 509305343 is a prime.

It is a super-2 number, since 2×509309439² = 518792209308989442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 509309439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509309639) 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, 14184 + ... + 34925.

It is an arithmetic number, because the mean of its divisors is an integer number (84911190).

Almost surely, 2^509309439 is an apocalyptic number.

509309439 is a deficient number, since it is larger than the sum of its proper divisors (169980081).

509309439 is a wasteful number, since it uses less digits than its factorization.

509309439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52569.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 509309439 is about 22567.8851246633. The cubic root of 509309439 is about 798.5962042836.

The spelling of 509309439 in words is "five hundred nine million, three hundred nine thousand, four hundred thirty-nine".