8443989 has 12 divisors (see below), whose sum is σ = 12229516. Its totient is φ = 5614272.

The previous prime is 8443969. The next prime is 8443993. The reversal of 8443989 is 9893448.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5963364 + 2480625 = 2442^2 + 1575^2 .

It is not a de Polignac number, because 8443989 - 2¹³ = 8435797 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 (8443949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3087 + ... + 5139.

Almost surely, 2^8443989 is an apocalyptic number.

It is an amenable number.

8443989 is a deficient number, since it is larger than the sum of its proper divisors (3785527).

8443989 is a wasteful number, since it uses less digits than its factorization.

8443989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516 (or 2513 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 8443989 is about 2905.8542633794. The cubic root of 8443989 is about 203.6334970740.

The spelling of 8443989 in words is "eight million, four hundred forty-three thousand, nine hundred eighty-nine".