398542171 has 2 divisors, whose sum is σ = 398542172. Its totient is φ = 398542170.

The previous prime is 398542163. The next prime is 398542223. The reversal of 398542171 is 171245893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398542171 - 2³ = 398542163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398542121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199271085 + 199271086.

It is an arithmetic number, because the mean of its divisors is an integer number (199271086).

Almost surely, 2^398542171 is an apocalyptic number.

398542171 is a deficient number, since it is larger than the sum of its proper divisors (1).

398542171 is an equidigital number, since it uses as much as digits as its factorization.

398542171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 398542171 is about 19963.5210070769. The cubic root of 398542171 is about 735.9100954249.

It can be divided in two parts, 39854 and 2171, that added together give a square (42025 = 205²).

The spelling of 398542171 in words is "three hundred ninety-eight million, five hundred forty-two thousand, one hundred seventy-one".