9904209855 has 16 divisors (see below), whose sum is σ = 16047329280. Its totient is φ = 5215380768.

The previous prime is 9904209851. The next prime is 9904209881. The reversal of 9904209855 is 5589024099.

It is not a de Polignac number, because 9904209855 - 2² = 9904209851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9904209798 and 9904209807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9904209851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4177807 + ... + 4180176.

It is an arithmetic number, because the mean of its divisors is an integer number (1002958080).

Almost surely, 2^9904209855 is an apocalyptic number.

9904209855 is a deficient number, since it is larger than the sum of its proper divisors (6143119425).

9904209855 is a wasteful number, since it uses less digits than its factorization.

9904209855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8358070.

The product of its (nonzero) digits is 1166400, while the sum is 51.

The square root of 9904209855 is about 99519.8967794883. The cubic root of 9904209855 is about 2147.5334869462.

The spelling of 9904209855 in words is "nine billion, nine hundred four million, two hundred nine thousand, eight hundred fifty-five".