400320017 has 2 divisors, whose sum is σ = 400320018. Its totient is φ = 400320016.

The previous prime is 400320007. The next prime is 400320047. The reversal of 400320017 is 710023004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298632961 + 101687056 = 17281^2 + 10084^2 .

It is a cyclic number.

It is not a de Polignac number, because 400320017 - 2⁴ = 400320001 is a prime.

It is a super-2 number, since 2×400320017² = 320512232021760578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400319977 and 400320004.

It is not a weakly prime, because it can be changed into another prime (400320007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200160008 + 200160009.

It is an arithmetic number, because the mean of its divisors is an integer number (200160009).

Almost surely, 2^400320017 is an apocalyptic number.

It is an amenable number.

400320017 is a deficient number, since it is larger than the sum of its proper divisors (1).

400320017 is an equidigital number, since it uses as much as digits as its factorization.

400320017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 400320017 is about 20007.9988254698. The cubic root of 400320017 is about 737.0027394687.

The spelling of 400320017 in words is "four hundred million, three hundred twenty thousand, seventeen".