8423404009 has 2 divisors, whose sum is σ = 8423404010. Its totient is φ = 8423404008.

The previous prime is 8423403983. The next prime is 8423404139. The reversal of 8423404009 is 9004043248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7818096400 + 605307609 = 88420^2 + 24603^2 .

It is a cyclic number.

It is not a de Polignac number, because 8423404009 - 2⁵ = 8423403977 is a prime.

It is not a weakly prime, because it can be changed into another prime (8423404709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4211702004 + 4211702005.

It is an arithmetic number, because the mean of its divisors is an integer number (4211702005).

Almost surely, 2^8423404009 is an apocalyptic number.

It is an amenable number.

8423404009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8423404009 is an equidigital number, since it uses as much as digits as its factorization.

8423404009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 8423404009 is about 91779.1044247001. The cubic root of 8423404009 is about 2034.6788795985.

The spelling of 8423404009 in words is "eight billion, four hundred twenty-three million, four hundred four thousand, nine".