398878098187 has 2 divisors, whose sum is σ = 398878098188. Its totient is φ = 398878098186.

The previous prime is 398878098097. The next prime is 398878098257. The reversal of 398878098187 is 781890878893.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398878098187 is a prime.

It is not a weakly prime, because it can be changed into another prime (398878068187) 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, 199439049093 + 199439049094.

It is an arithmetic number, because the mean of its divisors is an integer number (199439049094).

Almost surely, 2^398878098187 is an apocalyptic number.

398878098187 is a deficient number, since it is larger than the sum of its proper divisors (1).

398878098187 is an equidigital number, since it uses as much as digits as its factorization.

398878098187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 390168576, while the sum is 76.

The spelling of 398878098187 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, ninety-eight thousand, one hundred eighty-seven".