9909975 has 24 divisors (see below), whose sum is σ = 16484560. Its totient is φ = 5253120.

The previous prime is 9909961. The next prime is 9909989. The reversal of 9909975 is 5799099.

9909975 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9909961) and next prime (9909989).

It is not a de Polignac number, because 9909975 - 2⁵ = 9909943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16887 + ... + 17463.

Almost surely, 2^9909975 is an apocalyptic number.

9909975 is a deficient number, since it is larger than the sum of its proper divisors (6574585).

9909975 is a wasteful number, since it uses less digits than its factorization.

9909975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 229635, while the sum is 48.

The square root of 9909975 is about 3148.0112769811. The cubic root of 9909975 is about 214.7950092297.

The spelling of 9909975 in words is "nine million, nine hundred nine thousand, nine hundred seventy-five".