398429926057 has 2 divisors, whose sum is σ = 398429926058. Its totient is φ = 398429926056.

The previous prime is 398429926031. The next prime is 398429926121. The reversal of 398429926057 is 750629924893.

It is an a-pointer prime, because the next prime (398429926121) can be obtained adding 398429926057 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347326350336 + 51103575721 = 589344^2 + 226061^2 .

It is a cyclic number.

It is not a de Polignac number, because 398429926057 - 2²⁷ = 398295708329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398429926057.

It is not a weakly prime, because it can be changed into another prime (398429926957) 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, 199214963028 + 199214963029.

It is an arithmetic number, because the mean of its divisors is an integer number (199214963029).

Almost surely, 2^398429926057 is an apocalyptic number.

It is an amenable number.

398429926057 is a deficient number, since it is larger than the sum of its proper divisors (1).

398429926057 is an equidigital number, since it uses as much as digits as its factorization.

398429926057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 398429926057 in words is "three hundred ninety-eight billion, four hundred twenty-nine million, nine hundred twenty-six thousand, fifty-seven".