398522881 has 2 divisors, whose sum is σ = 398522882. Its totient is φ = 398522880.

The previous prime is 398522879. The next prime is 398522903. The reversal of 398522881 is 188225893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360392256 + 38130625 = 18984^2 + 6175^2 .

It is a cyclic number.

It is not a de Polignac number, because 398522881 - 2¹ = 398522879 is a prime.

It is a super-2 number, since 2×398522881² = 317640973361080322, which contains 22 as substring.

Together with 398522879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (398522801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199261440 + 199261441.

It is an arithmetic number, because the mean of its divisors is an integer number (199261441).

Almost surely, 2^398522881 is an apocalyptic number.

It is an amenable number.

398522881 is a deficient number, since it is larger than the sum of its proper divisors (1).

398522881 is an equidigital number, since it uses as much as digits as its factorization.

398522881 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 398522881 is about 19963.0378700237. The cubic root of 398522881 is about 735.8982222064.

The spelling of 398522881 in words is "three hundred ninety-eight million, five hundred twenty-two thousand, eight hundred eighty-one".