809439 has 8 divisors (see below), whose sum is σ = 1126272. Its totient is φ = 516120.

The previous prime is 809437. The next prime is 809443. The reversal of 809439 is 934908.

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

It is not a de Polignac number, because 809439 - 2¹ = 809437 is a prime.

809439 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5797 + ... + 5934.

It is an arithmetic number, because the mean of its divisors is an integer number (140784).

2⁸⁰⁹⁴³⁹ is an apocalyptic number.

809439 is a deficient number, since it is larger than the sum of its proper divisors (316833).

809439 is a wasteful number, since it uses less digits than its factorization.

809439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11757.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 809439 is about 899.6882793501. The cubic root of 809439 is about 93.1954497462.

The spelling of 809439 in words is "eight hundred nine thousand, four hundred thirty-nine".