539728309 has 8 divisors (see below), whose sum is σ = 568875960. Its totient is φ = 511283136.

The previous prime is 539728289. The next prime is 539728447. The reversal of 539728309 is 903827935.

It can be written as a sum of positive squares in 4 ways, for example, as 85100625 + 454627684 = 9225^2 + 21322^2 .

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 539728309 - 2⁷ = 539728181 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 (539728909) 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, 174042 + ... + 177115.

It is an arithmetic number, because the mean of its divisors is an integer number (71109495).

Almost surely, 2^539728309 is an apocalyptic number.

It is an amenable number.

539728309 is a deficient number, since it is larger than the sum of its proper divisors (29147651).

539728309 is a wasteful number, since it uses less digits than its factorization.

539728309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351239.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 539728309 is about 23232.0534822043. The cubic root of 539728309 is about 814.1886911720.

The spelling of 539728309 in words is "five hundred thirty-nine million, seven hundred twenty-eight thousand, three hundred nine".