889878989 has 8 divisors (see below), whose sum is σ = 906192000. Its totient is φ = 873692352.

The previous prime is 889878931. The next prime is 889879019. The reversal of 889878989 is 989878988.

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 889878989 - 2²⁸ = 621443533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (889808989) 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, 17324 + ... + 45605.

It is an arithmetic number, because the mean of its divisors is an integer number (113274000).

Almost surely, 2^889878989 is an apocalyptic number.

It is an amenable number.

889878989 is a deficient number, since it is larger than the sum of its proper divisors (16313011).

889878989 is a wasteful number, since it uses less digits than its factorization.

889878989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63187.

The product of its digits is 167215104, while the sum is 74.

The square root of 889878989 is about 29830.8395624394. The cubic root of 889878989 is about 961.8565739382.

Subtracting 889878989 from its reverse (989878988), we obtain a palindrome (99999999).

The spelling of 889878989 in words is "eight hundred eighty-nine million, eight hundred seventy-eight thousand, nine hundred eighty-nine".