9999889 has 2 divisors, whose sum is σ = 9999890.
Its totient is φ = 9999888.
The previous prime is 9999883. The next prime is 9999901. The reversal of 9999889 is 9889999.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 5919489 + 4080400 = 2433^2 + 2020^2
It is a cyclic number.
It is not a de Polignac number, because 9999889 - 27 = 9999761 is a prime.
It is not a weakly prime, because it can be changed into another prime (9999883) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999944 + 4999945.
It is an arithmetic number, because the mean of its divisors is an integer number (4999945).
Almost surely, 29999889 is an apocalyptic number.
It is an amenable number.
9999889 is a deficient number, since it is larger than the sum of its proper divisors (1).
9999889 is an equidigital number, since it uses as much as digits as its factorization.
9999889 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 3779136, while the sum is 61.
The square root of 9999889 is about 3162.2601094787.
The cubic root of 9999889 is about 215.4426718594.
The spelling of 9999889 in words is "nine million, nine hundred ninety-nine thousand, eight hundred eighty-nine".