989989 has 32 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 665280.

The previous prime is 989981. The next prime is 989999.

989989 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 989989 - 2³ = 989981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23002 + ... + 23044.

It is an arithmetic number, because the mean of its divisors is an integer number (44352).

2⁹⁸⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

989989 is a deficient number, since it is larger than the sum of its proper divisors (429275).

989989 is a wasteful number, since it uses less digits than its factorization.

989989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97.

The product of its digits is 419904, while the sum is 52.

The square root of 989989 is about 994.9819093833. The cubic root of 989989 is about 99.6651802082.

It can be divided in two parts, 9 and 89989, that added together give a palindrome (89998).

The spelling of 989989 in words is "nine hundred eighty-nine thousand, nine hundred eighty-nine".