8666849 has 2 divisors, whose sum is σ = 8666850. Its totient is φ = 8666848.

The previous prime is 8666839. The next prime is 8666863. The reversal of 8666849 is 9486668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8596624 + 70225 = 2932^2 + 265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8666849 is a prime.

It is a super-2 number, since 2×8666849² = 150228543177602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8666809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4333424 + 4333425.

It is an arithmetic number, because the mean of its divisors is an integer number (4333425).

Almost surely, 2^8666849 is an apocalyptic number.

It is an amenable number.

8666849 is a deficient number, since it is larger than the sum of its proper divisors (1).

8666849 is an equidigital number, since it uses as much as digits as its factorization.

8666849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The square root of 8666849 is about 2943.9512563900. The cubic root of 8666849 is about 205.4094454043.

The spelling of 8666849 in words is "eight million, six hundred sixty-six thousand, eight hundred forty-nine".