9998917 has 4 divisors (see below), whose sum is σ = 10269196. Its totient is φ = 9728640.

The previous prime is 9998903. The next prime is 9998929. The reversal of 9998917 is 7198999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6791236 + 3207681 = 2606^2 + 1791^2 .

It is a cyclic number.

It is not a de Polignac number, because 9998917 - 2¹⁹ = 9474629 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 (9998977) 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, 135084 + ... + 135157.

It is an arithmetic number, because the mean of its divisors is an integer number (2567299).

Almost surely, 2^9998917 is an apocalyptic number.

It is an amenable number.

9998917 is a deficient number, since it is larger than the sum of its proper divisors (270279).

9998917 is a wasteful number, since it uses less digits than its factorization.

9998917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270278.

The product of its digits is 367416, while the sum is 52.

The square root of 9998917 is about 3162.1064181966. The cubic root of 9998917 is about 215.4356912132.

The spelling of 9998917 in words is "nine million, nine hundred ninety-eight thousand, nine hundred seventeen".