398258281 has 2 divisors, whose sum is σ = 398258282. Its totient is φ = 398258280.

The previous prime is 398258261. The next prime is 398258291. The reversal of 398258281 is 182852893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229674025 + 168584256 = 15155^2 + 12984^2 .

It is a cyclic number.

It is not a de Polignac number, because 398258281 - 2⁵ = 398258249 is a prime.

It is a super-2 number, since 2×398258281² = 317219316770149922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398258261) 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, 199129140 + 199129141.

It is an arithmetic number, because the mean of its divisors is an integer number (199129141).

Almost surely, 2^398258281 is an apocalyptic number.

It is an amenable number.

398258281 is a deficient number, since it is larger than the sum of its proper divisors (1).

398258281 is an equidigital number, since it uses as much as digits as its factorization.

398258281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 398258281 is about 19956.4095217552. The cubic root of 398258281 is about 735.7353191550.

The spelling of 398258281 in words is "three hundred ninety-eight million, two hundred fifty-eight thousand, two hundred eighty-one".