8911989 has 12 divisors (see below), whose sum is σ = 12926316. Its totient is φ = 5916672.

The previous prime is 8911979. The next prime is 8911997. The reversal of 8911989 is 9891198.

It can be written as a sum of positive squares in 2 ways, for example, as 8803089 + 108900 = 2967^2 + 330^2 .

It is not a de Polignac number, because 8911989 - 2¹¹ = 8909941 is a prime.

It is a super-2 number, since 2×8911989² = 158847095872242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8911909) 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, 387 + ... + 4239.

It is an arithmetic number, because the mean of its divisors is an integer number (1077193).

Almost surely, 2^8911989 is an apocalyptic number.

It is an amenable number.

8911989 is a deficient number, since it is larger than the sum of its proper divisors (4014327).

8911989 is a wasteful number, since it uses less digits than its factorization.

8911989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4116 (or 4113 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 8911989 is about 2985.2954627641. The cubic root of 8911989 is about 207.3281220509.

The spelling of 8911989 in words is "eight million, nine hundred eleven thousand, nine hundred eighty-nine".