440344423 has 2 divisors, whose sum is σ = 440344424. Its totient is φ = 440344422.

The previous prime is 440344417. The next prime is 440344451. The reversal of 440344423 is 324443044.

It is an a-pointer prime, because the next prime (440344451) can be obtained adding 440344423 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440344423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 440344391 and 440344400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440344403) 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, 220172211 + 220172212.

It is an arithmetic number, because the mean of its divisors is an integer number (220172212).

Almost surely, 2^440344423 is an apocalyptic number.

440344423 is a deficient number, since it is larger than the sum of its proper divisors (1).

440344423 is an equidigital number, since it uses as much as digits as its factorization.

440344423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 28.

The square root of 440344423 is about 20984.3852185381. The cubic root of 440344423 is about 760.7888986183.

Adding to 440344423 its reverse (324443044), we get a palindrome (764787467).

The spelling of 440344423 in words is "four hundred forty million, three hundred forty-four thousand, four hundred twenty-three".