398826076861 has 2 divisors, whose sum is σ = 398826076862. Its totient is φ = 398826076860.

The previous prime is 398826076843. The next prime is 398826076877. The reversal of 398826076861 is 168670628893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387543600900 + 11282475961 = 622530^2 + 106219^2 .

It is a cyclic number.

It is not a de Polignac number, because 398826076861 - 2⁹ = 398826076349 is a prime.

It is a super-2 number, since 2×398826076861² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398826076793 and 398826076802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398826076811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199413038430 + 199413038431.

It is an arithmetic number, because the mean of its divisors is an integer number (199413038431).

Almost surely, 2^398826076861 is an apocalyptic number.

It is an amenable number.

398826076861 is a deficient number, since it is larger than the sum of its proper divisors (1).

398826076861 is an equidigital number, since it uses as much as digits as its factorization.

398826076861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 398826076861 in words is "three hundred ninety-eight billion, eight hundred twenty-six million, seventy-six thousand, eight hundred sixty-one".