8920809 has 6 divisors (see below), whose sum is σ = 12885626. Its totient is φ = 5947200.

The previous prime is 8920783. The next prime is 8920817. The reversal of 8920809 is 9080298.

It can be written as a sum of positive squares in only one way, i.e., 6487209 + 2433600 = 2547^2 + 1560^2 .

It is not a de Polignac number, because 8920809 - 2²¹ = 6823657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8920889) 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 5 ways as a sum of consecutive naturals, for example, 495592 + ... + 495609.

Almost surely, 2^8920809 is an apocalyptic number.

It is an amenable number.

8920809 is a deficient number, since it is larger than the sum of its proper divisors (3964817).

8920809 is a wasteful number, since it uses less digits than its factorization.

8920809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991207 (or 991204 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 8920809 is about 2986.7723381604. The cubic root of 8920809 is about 207.3964955313.

The spelling of 8920809 in words is "eight million, nine hundred twenty thousand, eight hundred nine".