398731873 has 2 divisors, whose sum is σ = 398731874. Its totient is φ = 398731872.

The previous prime is 398731859. The next prime is 398731903. The reversal of 398731873 is 378137893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390734289 + 7997584 = 19767^2 + 2828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398731873 is a prime.

It is not a weakly prime, because it can be changed into another prime (398731843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199365936 + 199365937.

It is an arithmetic number, because the mean of its divisors is an integer number (199365937).

Almost surely, 2^398731873 is an apocalyptic number.

It is an amenable number.

398731873 is a deficient number, since it is larger than the sum of its proper divisors (1).

398731873 is an equidigital number, since it uses as much as digits as its factorization.

398731873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 398731873 is about 19968.2716578075. The cubic root of 398731873 is about 736.0268387986.

The spelling of 398731873 in words is "three hundred ninety-eight million, seven hundred thirty-one thousand, eight hundred seventy-three".