440385839 has 2 divisors, whose sum is σ = 440385840. Its totient is φ = 440385838.

The previous prime is 440385773. The next prime is 440385893. The reversal of 440385839 is 938583044.

Together with next prime (440385893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440385839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 440385839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440385139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220192919 + 220192920.

It is an arithmetic number, because the mean of its divisors is an integer number (220192920).

Almost surely, 2^440385839 is an apocalyptic number.

440385839 is a deficient number, since it is larger than the sum of its proper divisors (1).

440385839 is an equidigital number, since it uses as much as digits as its factorization.

440385839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 440385839 is about 20985.3720243411. The cubic root of 440385839 is about 760.8127495281.

The spelling of 440385839 in words is "four hundred forty million, three hundred eighty-five thousand, eight hundred thirty-nine".