440783387021 has 2 divisors, whose sum is σ = 440783387022. Its totient is φ = 440783387020.

The previous prime is 440783387017. The next prime is 440783387063. The reversal of 440783387021 is 120783387044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 380795131396 + 59988255625 = 617086^2 + 244925^2 .

It is a cyclic number.

It is not a de Polignac number, because 440783387021 - 2² = 440783387017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440783387621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220391693510 + 220391693511.

It is an arithmetic number, because the mean of its divisors is an integer number (220391693511).

Almost surely, 2^440783387021 is an apocalyptic number.

It is an amenable number.

440783387021 is a deficient number, since it is larger than the sum of its proper divisors (1).

440783387021 is an equidigital number, since it uses as much as digits as its factorization.

440783387021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 440783387021 in words is "four hundred forty billion, seven hundred eighty-three million, three hundred eighty-seven thousand, twenty-one".