989878989 has 8 divisors (see below), whose sum is σ = 1439824032. Its totient is φ = 599926640.

The previous prime is 989878979. The next prime is 989878997.

989878989 is nontrivially palindromic in base 10.

989878989 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 989878989 - 2⁷ = 989878861 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 989878989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989878969) 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, 14998134 + ... + 14998199.

It is an arithmetic number, because the mean of its divisors is an integer number (179978004).

Almost surely, 2^989878989 is an apocalyptic number.

It is an amenable number.

989878989 is a deficient number, since it is larger than the sum of its proper divisors (449945043).

989878989 is a wasteful number, since it uses less digits than its factorization.

989878989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29996347.

The product of its digits is 188116992, while the sum is 75.

The square root of 989878989 is about 31462.3423953144. The cubic root of 989878989 is about 996.6148835835.

It can be divided in two parts, 989 and 878989, that added together give a palindrome (879978).

The spelling of 989878989 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, nine hundred eighty-nine".