398731903 has 2 divisors, whose sum is σ = 398731904. Its totient is φ = 398731902.

The previous prime is 398731873. The next prime is 398731909. The reversal of 398731903 is 309137893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398731903 - 2¹⁷ = 398600831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398731903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398731909) 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, 199365951 + 199365952.

It is an arithmetic number, because the mean of its divisors is an integer number (199365952).

Almost surely, 2^398731903 is an apocalyptic number.

398731903 is a deficient number, since it is larger than the sum of its proper divisors (1).

398731903 is an equidigital number, since it uses as much as digits as its factorization.

398731903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 398731903 is about 19968.2724089992. The cubic root of 398731903 is about 736.0268572578.

The spelling of 398731903 in words is "three hundred ninety-eight million, seven hundred thirty-one thousand, nine hundred three".