398528869 has 2 divisors, whose sum is σ = 398528870. Its totient is φ = 398528868.

The previous prime is 398528863. The next prime is 398528941. The reversal of 398528869 is 968825893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257987844 + 140541025 = 16062^2 + 11855^2 .

It is a cyclic number.

It is not a de Polignac number, because 398528869 - 2³ = 398528861 is a prime.

It is a super-2 number, since 2×398528869² = 317650518852838322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398528861) 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, 199264434 + 199264435.

It is an arithmetic number, because the mean of its divisors is an integer number (199264435).

Almost surely, 2^398528869 is an apocalyptic number.

It is an amenable number.

398528869 is a deficient number, since it is larger than the sum of its proper divisors (1).

398528869 is an equidigital number, since it uses as much as digits as its factorization.

398528869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 58.

The square root of 398528869 is about 19963.1878466341. The cubic root of 398528869 is about 735.9019079308.

The spelling of 398528869 in words is "three hundred ninety-eight million, five hundred twenty-eight thousand, eight hundred sixty-nine".