9929989 has 16 divisors (see below), whose sum is σ = 11249280. Its totient is φ = 8709120.

The previous prime is 9929981. The next prime is 9929993. The reversal of 9929989 is 9899299.

It is a cyclic number.

It is not a de Polignac number, because 9929989 - 2³ = 9929981 is a prime.

It is a Duffinian number.

9929989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9929981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22717 + ... + 23149.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^9929989 is an apocalyptic number.

It is an amenable number.

9929989 is a deficient number, since it is larger than the sum of its proper divisors (1319291).

9929989 is a wasteful number, since it uses less digits than its factorization.

9929989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its digits is 944784, while the sum is 55.

The square root of 9929989 is about 3151.1885059450. The cubic root of 9929989 is about 214.9395106558.

The spelling of 9929989 in words is "nine million, nine hundred twenty-nine thousand, nine hundred eighty-nine".