398823675868823 has 2 divisors, whose sum is σ = 398823675868824. Its totient is φ = 398823675868822.

The previous prime is 398823675868799. The next prime is 398823675868853. The reversal of 398823675868823 is 328868576328893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398823675868823 - 2⁶ = 398823675868759 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398823675868853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199411837934411 + 199411837934412.

It is an arithmetic number, because the mean of its divisors is an integer number (199411837934412).

Almost surely, 2^{398823675868823} is an apocalyptic number.

398823675868823 is a deficient number, since it is larger than the sum of its proper divisors (1).

398823675868823 is an equidigital number, since it uses as much as digits as its factorization.

398823675868823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40131624960, while the sum is 86.

The spelling of 398823675868823 in words is "three hundred ninety-eight trillion, eight hundred twenty-three billion, six hundred seventy-five million, eight hundred sixty-eight thousand, eight hundred twenty-three".