8668889 has 2 divisors, whose sum is σ = 8668890. Its totient is φ = 8668888.

The previous prime is 8668873. The next prime is 8668897. The reversal of 8668889 is 9888668.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8508889 + 160000 = 2917^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 8668889 - 2⁴ = 8668873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8668889.

It is not a weakly prime, because it can be changed into another prime (8668489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334444 + 4334445.

It is an arithmetic number, because the mean of its divisors is an integer number (4334445).

Almost surely, 2^8668889 is an apocalyptic number.

It is an amenable number.

8668889 is a deficient number, since it is larger than the sum of its proper divisors (1).

8668889 is an equidigital number, since it uses as much as digits as its factorization.

8668889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1327104, while the sum is 53.

The square root of 8668889 is about 2944.2977091320. The cubic root of 8668889 is about 205.4255605420.

The spelling of 8668889 in words is "eight million, six hundred sixty-eight thousand, eight hundred eighty-nine".