440408643839 has 2 divisors, whose sum is σ = 440408643840. Its totient is φ = 440408643838.

The previous prime is 440408643817. The next prime is 440408643841. The reversal of 440408643839 is 938346804044.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440408643839 is a prime.

Together with 440408643841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440408643139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220204321919 + 220204321920.

It is an arithmetic number, because the mean of its divisors is an integer number (220204321920).

Almost surely, 2^440408643839 is an apocalyptic number.

440408643839 is a deficient number, since it is larger than the sum of its proper divisors (1).

440408643839 is an equidigital number, since it uses as much as digits as its factorization.

440408643839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7962624, while the sum is 53.

The spelling of 440408643839 in words is "four hundred forty billion, four hundred eight million, six hundred forty-three thousand, eight hundred thirty-nine".