398618281 has 2 divisors, whose sum is σ = 398618282. Its totient is φ = 398618280.

The previous prime is 398618263. The next prime is 398618399. The reversal of 398618281 is 182816893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396368281 + 2250000 = 19909^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 398618281 - 2⁵ = 398618249 is a prime.

It is a super-2 number, since 2×398618281² = 317793067894789922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398618201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199309140 + 199309141.

It is an arithmetic number, because the mean of its divisors is an integer number (199309141).

Almost surely, 2^398618281 is an apocalyptic number.

It is an amenable number.

398618281 is a deficient number, since it is larger than the sum of its proper divisors (1).

398618281 is an equidigital number, since it uses as much as digits as its factorization.

398618281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 46.

The square root of 398618281 is about 19965.4271429389. The cubic root of 398618281 is about 735.9569382740.

The spelling of 398618281 in words is "three hundred ninety-eight million, six hundred eighteen thousand, two hundred eighty-one".