439909 has 8 divisors (see below), whose sum is σ = 471960. Its totient is φ = 408576.

The previous prime is 439903. The next prime is 439919. The reversal of 439909 is 909934.

It can be written as a sum of positive squares in 4 ways, for example, as 91809 + 348100 = 303^2 + 590^2 .

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 439909 - 2⁷ = 439781 is a prime.

It is a Duffinian number.

439909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1807 + ... + 2035.

It is an arithmetic number, because the mean of its divisors is an integer number (58995).

2⁴³⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

439909 is a deficient number, since it is larger than the sum of its proper divisors (32051).

439909 is a wasteful number, since it uses less digits than its factorization.

439909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 439909 is about 663.2563606932. The cubic root of 439909 is about 76.0538053889.

The spelling of 439909 in words is "four hundred thirty-nine thousand, nine hundred nine".