400278044311 has 2 divisors, whose sum is σ = 400278044312. Its totient is φ = 400278044310.

The previous prime is 400278044281. The next prime is 400278044317. The reversal of 400278044311 is 113440872004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400278044311 - 2⁷ = 400278044183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400278044317) 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, 200139022155 + 200139022156.

It is an arithmetic number, because the mean of its divisors is an integer number (200139022156).

Almost surely, 2^400278044311 is an apocalyptic number.

400278044311 is a deficient number, since it is larger than the sum of its proper divisors (1).

400278044311 is an equidigital number, since it uses as much as digits as its factorization.

400278044311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 400278044311 in words is "four hundred billion, two hundred seventy-eight million, forty-four thousand, three hundred eleven".