9878989 has 8 divisors (see below), whose sum is σ = 10559808. Its totient is φ = 9209280.

The previous prime is 9878929. The next prime is 9879007. The reversal of 9878989 is 9898789.

9878989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

9878989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is a cyclic number.

It is not a de Polignac number, because 9878989 - 2⁷ = 9878861 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9878929) 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, 897 + ... + 4534.

It is an arithmetic number, because the mean of its divisors is an integer number (1319976).

Almost surely, 2^9878989 is an apocalyptic number.

It is an amenable number.

9878989 is a deficient number, since it is larger than the sum of its proper divisors (680819).

9878989 is a wasteful number, since it uses less digits than its factorization.

9878989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555.

The product of its digits is 2612736, while the sum is 58.

The square root of 9878989 is about 3143.0859040122. The cubic root of 9878989 is about 214.5709055003.

The spelling of 9878989 in words is "nine million, eight hundred seventy-eight thousand, nine hundred eighty-nine".