9998145 has 24 divisors (see below), whose sum is σ = 17736576. Its totient is φ = 5207328.

The previous prime is 9998143. The next prime is 9998147. The reversal of 9998145 is 5418999.

It is an interprime number because it is at equal distance from previous prime (9998143) and next prime (9998147).

It is not a de Polignac number, because 9998145 - 2¹ = 9998143 is a prime.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 9998145.

It is not an unprimeable number, because it can be changed into a prime (9998141) 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, 649 + ... + 4518.

It is an arithmetic number, because the mean of its divisors is an integer number (739024).

Almost surely, 2^9998145 is an apocalyptic number.

It is an amenable number.

9998145 is a deficient number, since it is larger than the sum of its proper divisors (7738431).

9998145 is a wasteful number, since it uses less digits than its factorization.

9998145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221 (or 5218 counting only the distinct ones).

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

The square root of 9998145 is about 3161.9843453123. The cubic root of 9998145 is about 215.4301465916.

The spelling of 9998145 in words is "nine million, nine hundred ninety-eight thousand, one hundred forty-five".