398142881 has 2 divisors, whose sum is σ = 398142882. Its totient is φ = 398142880.

The previous prime is 398142869. The next prime is 398142893. The reversal of 398142881 is 188241893.

It is a balanced prime because it is at equal distance from previous prime (398142869) and next prime (398142893).

It can be written as a sum of positive squares in only one way, i.e., 361950625 + 36192256 = 19025^2 + 6016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398142881 is a prime.

It is a super-2 number, since 2×398142881² = 317035507381960322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398142281) 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, 199071440 + 199071441.

It is an arithmetic number, because the mean of its divisors is an integer number (199071441).

Almost surely, 2^398142881 is an apocalyptic number.

It is an amenable number.

398142881 is a deficient number, since it is larger than the sum of its proper divisors (1).

398142881 is an equidigital number, since it uses as much as digits as its factorization.

398142881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 398142881 is about 19953.5180106166. The cubic root of 398142881 is about 735.6642496491.

The spelling of 398142881 in words is "three hundred ninety-eight million, one hundred forty-two thousand, eight hundred eighty-one".