398851973881 has 2 divisors, whose sum is σ = 398851973882. Its totient is φ = 398851973880.

The previous prime is 398851973713. The next prime is 398851973909. The reversal of 398851973881 is 188379158893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371875553856 + 26976420025 = 609816^2 + 164245^2 .

It is a cyclic number.

It is not a de Polignac number, because 398851973881 - 2¹³ = 398851965689 is a prime.

It is a super-2 number, since 2×398851973881² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 398851973881.

It is not a weakly prime, because it can be changed into another prime (398851973081) 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, 199425986940 + 199425986941.

It is an arithmetic number, because the mean of its divisors is an integer number (199425986941).

Almost surely, 2^398851973881 is an apocalyptic number.

It is an amenable number.

398851973881 is a deficient number, since it is larger than the sum of its proper divisors (1).

398851973881 is an equidigital number, since it uses as much as digits as its factorization.

398851973881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104509440, while the sum is 70.

The spelling of 398851973881 in words is "three hundred ninety-eight billion, eight hundred fifty-one million, nine hundred seventy-three thousand, eight hundred eighty-one".