398005423 has 2 divisors, whose sum is σ = 398005424. Its totient is φ = 398005422.

The previous prime is 398005381. The next prime is 398005451. The reversal of 398005423 is 324500893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398005423 - 2⁹ = 398004911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398005123) 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, 199002711 + 199002712.

It is an arithmetic number, because the mean of its divisors is an integer number (199002712).

Almost surely, 2^398005423 is an apocalyptic number.

398005423 is a deficient number, since it is larger than the sum of its proper divisors (1).

398005423 is an equidigital number, since it uses as much as digits as its factorization.

398005423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 398005423 is about 19950.0732580109. The cubic root of 398005423 is about 735.5795777210.

The spelling of 398005423 in words is "three hundred ninety-eight million, five thousand, four hundred twenty-three".