8398640609 has 2 divisors, whose sum is σ = 8398640610. Its totient is φ = 8398640608.

The previous prime is 8398640597. The next prime is 8398640629. The reversal of 8398640609 is 9060468938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8076976384 + 321664225 = 89872^2 + 17935^2 .

It is a cyclic number.

It is not a de Polignac number, because 8398640609 - 2⁸ = 8398640353 is a prime.

It is not a weakly prime, because it can be changed into another prime (8398640629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4199320304 + 4199320305.

It is an arithmetic number, because the mean of its divisors is an integer number (4199320305).

Almost surely, 2^8398640609 is an apocalyptic number.

It is an amenable number.

8398640609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8398640609 is an equidigital number, since it uses as much as digits as its factorization.

8398640609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The square root of 8398640609 is about 91644.0975131514. The cubic root of 8398640609 is about 2032.6830505662.

The spelling of 8398640609 in words is "eight billion, three hundred ninety-eight million, six hundred forty thousand, six hundred nine".