400278044317 has 2 divisors, whose sum is σ = 400278044318. Its totient is φ = 400278044316.

The previous prime is 400278044311. The next prime is 400278044381. The reversal of 400278044317 is 713440872004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211875169401 + 188402874916 = 460299^2 + 434054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400278044317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400278044317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400278044311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200139022158 + 200139022159.

It is an arithmetic number, because the mean of its divisors is an integer number (200139022159).

Almost surely, 2^400278044317 is an apocalyptic number.

It is an amenable number.

400278044317 is a deficient number, since it is larger than the sum of its proper divisors (1).

400278044317 is an equidigital number, since it uses as much as digits as its factorization.

400278044317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 400278044317 in words is "four hundred billion, two hundred seventy-eight million, forty-four thousand, three hundred seventeen".