439309 has 8 divisors (see below), whose sum is σ = 483840. Its totient is φ = 396336.

The previous prime is 439303. The next prime is 439339. The reversal of 439309 is 903934.

439309 is nontrivially palindromic in base 12.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439309 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 (439303) 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, 252 + ... + 970.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2⁴³⁹³⁰⁹ is an apocalyptic number.

It is an amenable number.

439309 is a deficient number, since it is larger than the sum of its proper divisors (44531).

439309 is a wasteful number, since it uses less digits than its factorization.

439309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 439309 is about 662.8038925655. The cubic root of 439309 is about 76.0192125942.

Adding to 439309 its product of nonzero digits (2916), we get a square (442225 = 665²).

The spelling of 439309 in words is "four hundred thirty-nine thousand, three hundred nine".