8945809 has 2 divisors, whose sum is σ = 8945810. Its totient is φ = 8945808.

The previous prime is 8945779. The next prime is 8945813. The reversal of 8945809 is 9085498.

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., 8427409 + 518400 = 2903^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 8945809 - 2¹¹ = 8943761 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8945819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4472904 + 4472905.

It is an arithmetic number, because the mean of its divisors is an integer number (4472905).

Almost surely, 2^8945809 is an apocalyptic number.

It is an amenable number.

8945809 is a deficient number, since it is larger than the sum of its proper divisors (1).

8945809 is an equidigital number, since it uses as much as digits as its factorization.

8945809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 8945809 is about 2990.9545299118. The cubic root of 8945809 is about 207.5900533298.

The spelling of 8945809 in words is "eight million, nine hundred forty-five thousand, eight hundred nine".