989818989 has 8 divisors (see below), whose sum is σ = 1319940192. Its totient is φ = 659788560.

The previous prime is 989818957. The next prime is 989818997.

989818989 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 989818989 - 2⁵ = 989818957 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989818909) 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, 9127 + ... + 45419.

It is an arithmetic number, because the mean of its divisors is an integer number (164992524).

Almost surely, 2^989818989 is an apocalyptic number.

It is an amenable number.

989818989 is a deficient number, since it is larger than the sum of its proper divisors (330121203).

989818989 is a wasteful number, since it uses less digits than its factorization.

989818989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45387.

The product of its digits is 26873856, while the sum is 69.

The square root of 989818989 is about 31461.3888599979. The cubic root of 989818989 is about 996.5947470814.

The spelling of 989818989 in words is "nine hundred eighty-nine million, eight hundred eighteen thousand, nine hundred eighty-nine".