39438720717 has 16 divisors (see below), whose sum is σ = 60384645120. Its totient is φ = 22644241200.

The previous prime is 39438720689. The next prime is 39438720721. The reversal of 39438720717 is 71702783493.

It is a happy number.

It is not a de Polignac number, because 39438720717 - 2¹⁰ = 39438719693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39438720717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39438720757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31449709 + ... + 31450962.

It is an arithmetic number, because the mean of its divisors is an integer number (3774040320).

Almost surely, 2^39438720717 is an apocalyptic number.

It is an amenable number.

39438720717 is a deficient number, since it is larger than the sum of its proper divisors (20945924403).

39438720717 is a wasteful number, since it uses less digits than its factorization.

39438720717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62900704.

The product of its (nonzero) digits is 1778112, while the sum is 51.

The spelling of 39438720717 in words is "thirty-nine billion, four hundred thirty-eight million, seven hundred twenty thousand, seven hundred seventeen".