9989145 has 24 divisors (see below), whose sum is σ = 17686656. Its totient is φ = 5213088.

The previous prime is 9989123. The next prime is 9989159. The reversal of 9989145 is 5419899.

It is not a de Polignac number, because 9989145 - 2⁹ = 9988633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 9989145.

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, 247 + ... + 4476.

It is an arithmetic number, because the mean of its divisors is an integer number (736944).

Almost surely, 2^9989145 is an apocalyptic number.

It is an amenable number.

9989145 is a deficient number, since it is larger than the sum of its proper divisors (7697511).

9989145 is a wasteful number, since it uses less digits than its factorization.

9989145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781 (or 4778 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 9989145 is about 3160.5608679473. The cubic root of 9989145 is about 215.3654861510.

The spelling of 9989145 in words is "nine million, nine hundred eighty-nine thousand, one hundred forty-five".