400244220391 has 2 divisors, whose sum is σ = 400244220392. Its totient is φ = 400244220390.

The previous prime is 400244220367. The next prime is 400244220401. The reversal of 400244220391 is 193022442004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400244220391 - 2⁵ = 400244220359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400244220991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200122110195 + 200122110196.

It is an arithmetic number, because the mean of its divisors is an integer number (200122110196).

Almost surely, 2^400244220391 is an apocalyptic number.

400244220391 is a deficient number, since it is larger than the sum of its proper divisors (1).

400244220391 is an equidigital number, since it uses as much as digits as its factorization.

400244220391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 400244220391 its reverse (193022442004), we get a palindrome (593266662395).

The spelling of 400244220391 in words is "four hundred billion, two hundred forty-four million, two hundred twenty thousand, three hundred ninety-one".