9998815 has 8 divisors (see below), whose sum is σ = 12195648. Its totient is φ = 7867680.

The previous prime is 9998809. The next prime is 9998851. The reversal of 9998815 is 5188999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-9998815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16087 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (1524456).

Almost surely, 2^9998815 is an apocalyptic number.

9998815 is a deficient number, since it is larger than the sum of its proper divisors (2196833).

9998815 is a wasteful number, since it uses less digits than its factorization.

9998815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32849.

The product of its digits is 233280, while the sum is 49.

The square root of 9998815 is about 3162.0902896660. The cubic root of 9998815 is about 215.4349586500.

The spelling of 9998815 in words is "nine million, nine hundred ninety-eight thousand, eight hundred fifteen".