400443217 has 2 divisors, whose sum is σ = 400443218. Its totient is φ = 400443216.

The previous prime is 400443137. The next prime is 400443233. The reversal of 400443217 is 712344004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311310736 + 89132481 = 17644^2 + 9441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400443217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400443191 and 400443200.

It is not a weakly prime, because it can be changed into another prime (400443247) 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, 200221608 + 200221609.

It is an arithmetic number, because the mean of its divisors is an integer number (200221609).

Almost surely, 2^400443217 is an apocalyptic number.

It is an amenable number.

400443217 is a deficient number, since it is larger than the sum of its proper divisors (1).

400443217 is an equidigital number, since it uses as much as digits as its factorization.

400443217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 400443217 is about 20011.0773573039. The cubic root of 400443217 is about 737.0783368414.

The spelling of 400443217 in words is "four hundred million, four hundred forty-three thousand, two hundred seventeen".