9899989 has 8 divisors (see below), whose sum is σ = 10831968. Its totient is φ = 8973360.

The previous prime is 9899977. The next prime is 9899993.

9899989 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9899989 - 2⁷ = 9899861 is a prime.

It is an Ulam number.

It is a Duffinian number.

9899989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3234 + ... + 5500.

It is an arithmetic number, because the mean of its divisors is an integer number (1353996).

Almost surely, 2^9899989 is an apocalyptic number.

It is an amenable number.

9899989 is a deficient number, since it is larger than the sum of its proper divisors (931979).

9899989 is a wasteful number, since it uses less digits than its factorization.

9899989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675.

The product of its digits is 3779136, while the sum is 61.

The square root of 9899989 is about 3146.4247964952. The cubic root of 9899989 is about 214.7228373749.

It can be divided in two parts, 9 and 899989, that added together give a palindrome (899998).

The spelling of 9899989 in words is "nine million, eight hundred ninety-nine thousand, nine hundred eighty-nine".