8817989 has 4 divisors (see below), whose sum is σ = 8846124. Its totient is φ = 8789856.

The previous prime is 8817973. The next prime is 8818009. The reversal of 8817989 is 9897188.

It is a happy number.

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 2356225 + 6461764 = 1535^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 8817989 - 2⁴ = 8817973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8817959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13592 + ... + 14225.

It is an arithmetic number, because the mean of its divisors is an integer number (2211531).

Almost surely, 2^8817989 is an apocalyptic number.

It is an amenable number.

8817989 is a deficient number, since it is larger than the sum of its proper divisors (28135).

8817989 is a wasteful number, since it uses less digits than its factorization.

8817989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28134.

The product of its digits is 290304, while the sum is 50.

The square root of 8817989 is about 2969.5098922213. The cubic root of 8817989 is about 206.5966067877.

The spelling of 8817989 in words is "eight million, eight hundred seventeen thousand, nine hundred eighty-nine".