398823968617 has 2 divisors, whose sum is σ = 398823968618. Its totient is φ = 398823968616.

The previous prime is 398823968597. The next prime is 398823968651. The reversal of 398823968617 is 716869328893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329463372121 + 69360596496 = 573989^2 + 263364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398823968617 is a prime.

It is a super-3 number, since 3×398823968617³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (398823968657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199411984308 + 199411984309.

It is an arithmetic number, because the mean of its divisors is an integer number (199411984309).

Almost surely, 2^398823968617 is an apocalyptic number.

It is an amenable number.

398823968617 is a deficient number, since it is larger than the sum of its proper divisors (1).

398823968617 is an equidigital number, since it uses as much as digits as its factorization.

398823968617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188116992, while the sum is 70.

The spelling of 398823968617 in words is "three hundred ninety-eight billion, eight hundred twenty-three million, nine hundred sixty-eight thousand, six hundred seventeen".