9998889 has 4 divisors (see below), whose sum is σ = 13331856. Its totient is φ = 6665924.

The previous prime is 9998887. The next prime is 9998893. The reversal of 9998889 is 9888999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9998889 - 2¹ = 9998887 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9998887) 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, 1666479 + ... + 1666484.

It is an arithmetic number, because the mean of its divisors is an integer number (3332964).

Almost surely, 2^9998889 is an apocalyptic number.

It is an amenable number.

9998889 is a deficient number, since it is larger than the sum of its proper divisors (3332967).

9998889 is a wasteful number, since it uses less digits than its factorization.

9998889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332966.

The product of its digits is 3359232, while the sum is 60.

The square root of 9998889 is about 3162.1019907650. The cubic root of 9998889 is about 215.4354901179.

The spelling of 9998889 in words is "nine million, nine hundred ninety-eight thousand, eight hundred eighty-nine".