839440809 has 6 divisors (see below), whose sum is σ = 1212525626. Its totient is φ = 559627200.

The previous prime is 839440799. The next prime is 839440853. The reversal of 839440809 is 908044938.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 597949209 + 241491600 = 24453^2 + 15540^2 .

It is not a de Polignac number, because 839440809 - 2²⁴ = 822663593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (839440859) 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 5 ways as a sum of consecutive naturals, for example, 46635592 + ... + 46635609.

Almost surely, 2^839440809 is an apocalyptic number.

It is an amenable number.

839440809 is a deficient number, since it is larger than the sum of its proper divisors (373084817).

839440809 is a wasteful number, since it uses less digits than its factorization.

839440809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93271207 (or 93271204 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 839440809 is about 28973.1049250853. The cubic root of 839440809 is about 943.3293772040.

The spelling of 839440809 in words is "eight hundred thirty-nine million, four hundred forty thousand, eight hundred nine".