8889889 has 2 divisors, whose sum is σ = 8889890. Its totient is φ = 8889888.

The previous prime is 8889883. The next prime is 8889893. The reversal of 8889889 is 9889888.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6027025 + 2862864 = 2455^2 + 1692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8889889 is a prime.

It is not a weakly prime, because it can be changed into another prime (8889883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4444944 + 4444945.

It is an arithmetic number, because the mean of its divisors is an integer number (4444945).

Almost surely, 2^8889889 is an apocalyptic number.

It is an amenable number.

8889889 is a deficient number, since it is larger than the sum of its proper divisors (1).

8889889 is an equidigital number, since it uses as much as digits as its factorization.

8889889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 58.

The square root of 8889889 is about 2981.5916890144. The cubic root of 8889889 is about 207.1566023833.

Subtracting 8889889 from its reverse (9889888), we obtain a palindrome (999999).

The spelling of 8889889 in words is "eight million, eight hundred eighty-nine thousand, eight hundred eighty-nine".