8009989 has 4 divisors (see below), whose sum is σ = 8626156. Its totient is φ = 7393824.

The previous prime is 8009987. The next prime is 8009999. The reversal of 8009989 is 9899008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1119364 + 6890625 = 1058^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 8009989 - 2¹ = 8009987 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 (8009987) 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 3 ways as a sum of consecutive naturals, for example, 308064 + ... + 308089.

It is an arithmetic number, because the mean of its divisors is an integer number (2156539).

Almost surely, 2^8009989 is an apocalyptic number.

It is an amenable number.

8009989 is a deficient number, since it is larger than the sum of its proper divisors (616167).

8009989 is a wasteful number, since it uses less digits than its factorization.

8009989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616166.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 8009989 is about 2830.1923962869. The cubic root of 8009989 is about 200.0832070448.

It can be divided in two parts, 8009 and 989, that added together give a palindrome (8998).

The spelling of 8009989 in words is "eight million, nine thousand, nine hundred eighty-nine".