8991745 has 24 divisors (see below), whose sum is σ = 12705984. Its totient is φ = 6108144.

The previous prime is 8991743. The next prime is 8991757. The reversal of 8991745 is 5471998.

It is not a de Polignac number, because 8991745 - 2¹ = 8991743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83982 + ... + 84088.

It is an arithmetic number, because the mean of its divisors is an integer number (529416).

Almost surely, 2^8991745 is an apocalyptic number.

It is an amenable number.

8991745 is a deficient number, since it is larger than the sum of its proper divisors (3714239).

8991745 is an frugal number, since it uses more digits than its factorization.

8991745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 119 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 8991745 is about 2998.6238510357. The cubic root of 8991745 is about 207.9447662143.

The spelling of 8991745 in words is "eight million, nine hundred ninety-one thousand, seven hundred forty-five".