9820809 has 12 divisors (see below), whose sum is σ = 14357616. Its totient is φ = 6467832.

The previous prime is 9820801. The next prime is 9820823. The reversal of 9820809 is 9080289.

9820809 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9820809 - 2³ = 9820801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9820801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5827 + ... + 7320.

It is an arithmetic number, because the mean of its divisors is an integer number (1196468).

Almost surely, 2^9820809 is an apocalyptic number.

It is an amenable number.

9820809 is a deficient number, since it is larger than the sum of its proper divisors (4536807).

9820809 is a wasteful number, since it uses less digits than its factorization.

9820809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13236 (or 13233 counting only the distinct ones).

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

The square root of 9820809 is about 3133.8170016770. The cubic root of 9820809 is about 214.1488541325.

The spelling of 9820809 in words is "nine million, eight hundred twenty thousand, eight hundred nine".