9999904 has 24 divisors (see below), whose sum is σ = 19839708. Its totient is φ = 4961280.

The previous prime is 9999901. The next prime is 9999907. The reversal of 9999904 is 4099999.

It is an interprime number because it is at equal distance from previous prime (9999901) and next prime (9999907).

It can be written as a sum of positive squares in 2 ways, for example, as 9909904 + 90000 = 3148^2 + 300^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3244 + ... + 5524.

Almost surely, 2^9999904 is an apocalyptic number.

It is an amenable number.

9999904 is a deficient number, since it is larger than the sum of its proper divisors (9839804).

9999904 is a wasteful number, since it uses less digits than its factorization.

9999904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428 (or 2420 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 9999904 is about 3162.2624811992. The cubic root of 9999904 is about 215.4427795819.

The spelling of 9999904 in words is "nine million, nine hundred ninety-nine thousand, nine hundred four".