398341681 has 2 divisors, whose sum is σ = 398341682. Its totient is φ = 398341680.

The previous prime is 398341679. The next prime is 398341687. The reversal of 398341681 is 186143893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292581025 + 105760656 = 17105^2 + 10284^2 .

It is a cyclic number.

It is not a de Polignac number, because 398341681 - 2¹ = 398341679 is a prime.

It is a super-2 number, since 2×398341681² = 317352189643811522, which contains 22 as substring.

Together with 398341679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (398341687) 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, 199170840 + 199170841.

It is an arithmetic number, because the mean of its divisors is an integer number (199170841).

Almost surely, 2^398341681 is an apocalyptic number.

It is an amenable number.

398341681 is a deficient number, since it is larger than the sum of its proper divisors (1).

398341681 is an equidigital number, since it uses as much as digits as its factorization.

398341681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 398341681 is about 19958.4989666057. The cubic root of 398341681 is about 735.7866727998.

The spelling of 398341681 in words is "three hundred ninety-eight million, three hundred forty-one thousand, six hundred eighty-one".