989489984989 has 16 divisors (see below), whose sum is σ = 1084528111680. Its totient is φ = 895302495360.

The previous prime is 989489984897. The next prime is 989489984999.

989489984989 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 989489984989 - 2²¹ = 989487887837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 989489984897 and 989489984906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989489984999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6166822 + ... + 6325240.

It is an arithmetic number, because the mean of its divisors is an integer number (67783006980).

Almost surely, 2^989489984989 is an apocalyptic number.

It is an amenable number.

989489984989 is a deficient number, since it is larger than the sum of its proper divisors (95038126691).

989489984989 is a wasteful number, since it uses less digits than its factorization.

989489984989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161100.

The product of its digits is 34828517376, while the sum is 94.

The spelling of 989489984989 in words is "nine hundred eighty-nine billion, four hundred eighty-nine million, nine hundred eighty-four thousand, nine hundred eighty-nine".