398043823 has 2 divisors, whose sum is σ = 398043824. Its totient is φ = 398043822.

The previous prime is 398043803. The next prime is 398043829. The reversal of 398043823 is 328340893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398043823 - 2⁹ = 398043311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398043829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199021911 + 199021912.

It is an arithmetic number, because the mean of its divisors is an integer number (199021912).

Almost surely, 2^398043823 is an apocalyptic number.

398043823 is a deficient number, since it is larger than the sum of its proper divisors (1).

398043823 is an equidigital number, since it uses as much as digits as its factorization.

398043823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 398043823 is about 19951.0356372796. The cubic root of 398043823 is about 735.6032334686.

The spelling of 398043823 in words is "three hundred ninety-eight million, forty-three thousand, eight hundred twenty-three".