8991375 has 16 divisors (see below), whose sum is σ = 14962272. Its totient is φ = 4795200.

The previous prime is 8991371. The next prime is 8991377. The reversal of 8991375 is 5731998.

It is a happy number.

It is not a de Polignac number, because 8991375 - 2² = 8991371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11614 + ... + 12363.

It is an arithmetic number, because the mean of its divisors is an integer number (935142).

Almost surely, 2^8991375 is an apocalyptic number.

8991375 is a deficient number, since it is larger than the sum of its proper divisors (5970897).

8991375 is a wasteful number, since it uses less digits than its factorization.

8991375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23995 (or 23985 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 8991375 is about 2998.5621554338. The cubic root of 8991375 is about 207.9419139456.

The spelling of 8991375 in words is "eight million, nine hundred ninety-one thousand, three hundred seventy-five".