9989889 has 64 divisors (see below), whose sum is σ = 17977344. Its totient is φ = 4790016.

The previous prime is 9989887. The next prime is 9989899. The reversal of 9989889 is 9889899.

It is not a de Polignac number, because 9989889 - 2¹ = 9989887 is a prime.

9989889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9989887) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 232302 + ... + 232344.

It is an arithmetic number, because the mean of its divisors is an integer number (280896).

Almost surely, 2^9989889 is an apocalyptic number.

It is an amenable number.

9989889 is a deficient number, since it is larger than the sum of its proper divisors (7987455).

9989889 is a wasteful number, since it uses less digits than its factorization.

9989889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126.

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

The square root of 9989889 is about 3160.6785663841. The cubic root of 9989889 is about 215.3708328864.

It can be divided in two parts, 9989 and 889, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 9989889 in words is "nine million, nine hundred eighty-nine thousand, eight hundred eighty-nine".