9904805 has 16 divisors (see below), whose sum is σ = 12458880. Its totient is φ = 7549248.

The previous prime is 9904801. The next prime is 9904819. The reversal of 9904805 is 5084099.

It is a cyclic number.

It is not a de Polignac number, because 9904805 - 2² = 9904801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9904801) 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 15 ways as a sum of consecutive naturals, for example, 11624 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (778680).

Almost surely, 2^9904805 is an apocalyptic number.

It is an amenable number.

9904805 is a deficient number, since it is larger than the sum of its proper divisors (2554075).

9904805 is a wasteful number, since it uses less digits than its factorization.

9904805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 9904805 is about 3147.1900165068. The cubic root of 9904805 is about 214.7576501255.

The spelling of 9904805 in words is "nine million, nine hundred four thousand, eight hundred five".