9904 has 10 divisors (see below), whose sum is σ = 19220. Its totient is φ = 4944.

The previous prime is 9901. The next prime is 9907. The reversal of 9904 is 4099.

It is an interprime number because it is at equal distance from previous prime (9901) and next prime (9907).

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (9901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 294 + ... + 325.

It is an arithmetic number, because the mean of its divisors is an integer number (1922).

2⁹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

9904 is a deficient number, since it is larger than the sum of its proper divisors (9316).

9904 is a wasteful number, since it uses less digits than its factorization.

9904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 9904 is about 99.5188424370. The cubic root of 9904 is about 21.4751831919.

The spelling of 9904 in words is "nine thousand, nine hundred four".