9999975 has 24 divisors (see below), whose sum is σ = 16661632. Its totient is φ = 5292000.

The previous prime is 9999973. The next prime is 9999991. The reversal of 9999975 is 5799999.

9999975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9999975 - 2¹ = 9999973 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10884 + ... + 11766.

Almost surely, 2^9999975 is an apocalyptic number.

9999975 is a deficient number, since it is larger than the sum of its proper divisors (6661657).

9999975 is a wasteful number, since it uses less digits than its factorization.

9999975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1042 counting only the distinct ones).

The product of its digits is 2066715, while the sum is 57.

The square root of 9999975 is about 3162.2737073188. The cubic root of 9999975 is about 215.4432894668.

The spelling of 9999975 in words is "nine million, nine hundred ninety-nine thousand, nine hundred seventy-five".