8638909 has 2 divisors, whose sum is σ = 8638910. Its totient is φ = 8638908.

The previous prime is 8638891. The next prime is 8638933. The reversal of 8638909 is 9098368.

8638909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 770884 = 2805^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 8638909 - 2²³ = 250301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8638999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4319454 + 4319455.

It is an arithmetic number, because the mean of its divisors is an integer number (4319455).

Almost surely, 2^8638909 is an apocalyptic number.

It is an amenable number.

8638909 is a deficient number, since it is larger than the sum of its proper divisors (1).

8638909 is an equidigital number, since it uses as much as digits as its factorization.

8638909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 8638909 is about 2939.2021026122. The cubic root of 8638909 is about 205.1884762758.

The spelling of 8638909 in words is "eight million, six hundred thirty-eight thousand, nine hundred nine".