9888889 has 2 divisors, whose sum is σ = 9888890. Its totient is φ = 9888888.

The previous prime is 9888887. The next prime is 9888929.

9888889 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8363664 + 1525225 = 2892^2 + 1235^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 9888889 - 2¹ = 9888887 is a prime.

Together with 9888887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9888881) by changing a digit.

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 as a sum of consecutive naturals, namely, 4944444 + 4944445.

It is an arithmetic number, because the mean of its divisors is an integer number (4944445).

Almost surely, 2^9888889 is an apocalyptic number.

It is an amenable number.

9888889 is a deficient number, since it is larger than the sum of its proper divisors (1).

9888889 is an equidigital number, since it uses as much as digits as its factorization.

9888889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 58.

The square root of 9888889 is about 3144.6603950188. The cubic root of 9888889 is about 214.6425573252.

The spelling of 9888889 in words is "nine million, eight hundred eighty-eight thousand, eight hundred eighty-nine".