398541791 has 2 divisors, whose sum is σ = 398541792. Its totient is φ = 398541790.

The previous prime is 398541749. The next prime is 398541799. The reversal of 398541791 is 197145893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398541791 - 2¹⁰ = 398540767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398541799) 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, 199270895 + 199270896.

It is an arithmetic number, because the mean of its divisors is an integer number (199270896).

Almost surely, 2^398541791 is an apocalyptic number.

398541791 is a deficient number, since it is larger than the sum of its proper divisors (1).

398541791 is an equidigital number, since it uses as much as digits as its factorization.

398541791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 398541791 is about 19963.5114897154. The cubic root of 398541791 is about 735.9098615342.

The spelling of 398541791 in words is "three hundred ninety-eight million, five hundred forty-one thousand, seven hundred ninety-one".