400444444423 has 2 divisors, whose sum is σ = 400444444424. Its totient is φ = 400444444422.

The previous prime is 400444444417. The next prime is 400444444441. The reversal of 400444444423 is 324444444004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400444444423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400444444453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200222222211 + 200222222212.

It is an arithmetic number, because the mean of its divisors is an integer number (200222222212).

Almost surely, 2^400444444423 is an apocalyptic number.

400444444423 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444444423 is an equidigital number, since it uses as much as digits as its factorization.

400444444423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 393216, while the sum is 37.

Adding to 400444444423 its reverse (324444444004), we get a palindrome (724888888427).

The spelling of 400444444423 in words is "four hundred billion, four hundred forty-four million, four hundred forty-four thousand, four hundred twenty-three".