398193281 has 2 divisors, whose sum is σ = 398193282. Its totient is φ = 398193280.

The previous prime is 398193269. The next prime is 398193307. The reversal of 398193281 is 182391893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286151056 + 112042225 = 16916^2 + 10585^2 .

It is a cyclic number.

It is not a de Polignac number, because 398193281 - 2²⁶ = 331084417 is a prime.

It is a super-2 number, since 2×398193281² = 317115778067089922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398193221) 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, 199096640 + 199096641.

It is an arithmetic number, because the mean of its divisors is an integer number (199096641).

Almost surely, 2^398193281 is an apocalyptic number.

It is an amenable number.

398193281 is a deficient number, since it is larger than the sum of its proper divisors (1).

398193281 is an equidigital number, since it uses as much as digits as its factorization.

398193281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 398193281 is about 19954.7809058381. The cubic root of 398193281 is about 735.6952903597.

The spelling of 398193281 in words is "three hundred ninety-eight million, one hundred ninety-three thousand, two hundred eighty-one".