398878068187 has 2 divisors, whose sum is σ = 398878068188. Its totient is φ = 398878068186.

The previous prime is 398878068181. The next prime is 398878068221. The reversal of 398878068187 is 781860878893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398878068187 - 2³ = 398878068179 is a prime.

It is not a weakly prime, because it can be changed into another prime (398878068181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199439034093 + 199439034094.

It is an arithmetic number, because the mean of its divisors is an integer number (199439034094).

Almost surely, 2^398878068187 is an apocalyptic number.

398878068187 is a deficient number, since it is larger than the sum of its proper divisors (1).

398878068187 is an equidigital number, since it uses as much as digits as its factorization.

398878068187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 260112384, while the sum is 73.

The spelling of 398878068187 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, sixty-eight thousand, one hundred eighty-seven".