400447169 has 2 divisors, whose sum is σ = 400447170. Its totient is φ = 400447168.

The previous prime is 400447163. The next prime is 400447217. The reversal of 400447169 is 961744004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319086769 + 81360400 = 17863^2 + 9020^2 .

It is a cyclic number.

It is not a de Polignac number, because 400447169 - 2⁸ = 400446913 is a prime.

It is a super-2 number, since 2×400447169² = 320715870320229122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400447163) 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, 200223584 + 200223585.

It is an arithmetic number, because the mean of its divisors is an integer number (200223585).

Almost surely, 2^400447169 is an apocalyptic number.

It is an amenable number.

400447169 is a deficient number, since it is larger than the sum of its proper divisors (1).

400447169 is an equidigital number, since it uses as much as digits as its factorization.

400447169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 400447169 is about 20011.1761023684. The cubic root of 400447169 is about 737.0807615913.

The spelling of 400447169 in words is "four hundred million, four hundred forty-seven thousand, one hundred sixty-nine".