9998015 has 4 divisors (see below), whose sum is σ = 11997624. Its totient is φ = 7998408.

The previous prime is 9997997. The next prime is 9998017. The reversal of 9998015 is 5108999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9998015 - 2⁶ = 9997951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999797 + ... + 999806.

It is an arithmetic number, because the mean of its divisors is an integer number (2999406).

Almost surely, 2^9998015 is an apocalyptic number.

9998015 is a deficient number, since it is larger than the sum of its proper divisors (1999609).

9998015 is a wasteful number, since it uses less digits than its factorization.

9998015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999608.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 9998015 is about 3161.9637885340. The cubic root of 9998015 is about 215.4292128837.

The spelling of 9998015 in words is "nine million, nine hundred ninety-eight thousand, fifteen".