8426009 has 2 divisors, whose sum is σ = 8426010. Its totient is φ = 8426008.

The previous prime is 8425997. The next prime is 8426021. The reversal of 8426009 is 9006248.

It is a balanced prime because it is at equal distance from previous prime (8425997) and next prime (8426021).

It can be written as a sum of positive squares in only one way, i.e., 5856400 + 2569609 = 2420^2 + 1603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8426009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8426039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4213004 + 4213005.

It is an arithmetic number, because the mean of its divisors is an integer number (4213005).

Almost surely, 2^8426009 is an apocalyptic number.

It is an amenable number.

8426009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8426009 is an equidigital number, since it uses as much as digits as its factorization.

8426009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 8426009 is about 2902.7588601191. The cubic root of 8426009 is about 203.4888603754.

The spelling of 8426009 in words is "eight million, four hundred twenty-six thousand, nine".