Search a number
8989 = 89101

8989 has 4 divisors (see below), whose sum is σ = 9180. Its totient is φ = 8800.

The previous prime is 8971. The next prime is 8999. The reversal of 8989 is 9898.

8989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

8989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 5625 + 3364 = 75^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 8989 - 27 = 8861 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

8989 is an undulating number in base 10.

8989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39 + ... + 139.

It is an arithmetic number, because the mean of its divisors is an integer number (2295).

28989 is an apocalyptic number.

8989 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

8989 is a deficient number, since it is larger than the sum of its proper divisors (191).

8989 is a wasteful number, since it uses less digits than its factorization.

8989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190.

The product of its digits is 5184, while the sum is 34.

The square root of 8989 is about 94.8103369892. The cubic root of 8989 is about 20.7923603601.

Subtracting 8989 from its reverse (9898), we obtain a palindrome (909).

The spelling of 8989 in words is "eight thousand, nine hundred eighty-nine".

Divisors: 1 89 101 8989