398755169 has 2 divisors, whose sum is σ = 398755170. Its totient is φ = 398755168.

The previous prime is 398755151. The next prime is 398755183. The reversal of 398755169 is 961557893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340033600 + 58721569 = 18440^2 + 7663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398755169 is a prime.

It is a super-2 number, since 2×398755169² = 318011369608437122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398755169.

It is not a weakly prime, because it can be changed into another prime (398755129) 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, 199377584 + 199377585.

It is an arithmetic number, because the mean of its divisors is an integer number (199377585).

Almost surely, 2^398755169 is an apocalyptic number.

It is an amenable number.

398755169 is a deficient number, since it is larger than the sum of its proper divisors (1).

398755169 is an equidigital number, since it uses as much as digits as its factorization.

398755169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 53.

The square root of 398755169 is about 19968.8549746850. The cubic root of 398755169 is about 736.0411726977.

The spelling of 398755169 in words is "three hundred ninety-eight million, seven hundred fifty-five thousand, one hundred sixty-nine".