9928809 has 12 divisors (see below), whose sum is σ = 15645552. Its totient is φ = 6017400.

The previous prime is 9928783. The next prime is 9928813. The reversal of 9928809 is 9088299.

It is not a de Polignac number, because 9928809 - 2⁸ = 9928553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9928859) 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, 50047 + ... + 50244.

It is an arithmetic number, because the mean of its divisors is an integer number (1303796).

Almost surely, 2^9928809 is an apocalyptic number.

9928809 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

9928809 is a deficient number, since it is larger than the sum of its proper divisors (5716743).

9928809 is a wasteful number, since it uses less digits than its factorization.

9928809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100308 (or 100305 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 9928809 is about 3151.0012694380. The cubic root of 9928809 is about 214.9309964245.

It can be divided in two parts, 992 and 8809, that added together give a square (9801 = 99²).

The spelling of 9928809 in words is "nine million, nine hundred twenty-eight thousand, eight hundred nine".