39747928723 has 4 divisors (see below), whose sum is σ = 39753722160. Its totient is φ = 39742135288.

The previous prime is 39747928721. The next prime is 39747928733. The reversal of 39747928723 is 32782974793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32782974793 = 17117 ⋅1915229.

It is a cyclic number.

It is not a de Polignac number, because 39747928723 - 2¹ = 39747928721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39747928721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2886415 + ... + 2900152.

It is an arithmetic number, because the mean of its divisors is an integer number (9938430540).

Almost surely, 2^39747928723 is an apocalyptic number.

39747928723 is a deficient number, since it is larger than the sum of its proper divisors (5793437).

39747928723 is an equidigital number, since it uses as much as digits as its factorization.

39747928723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793436.

The product of its digits is 32006016, while the sum is 61.

The spelling of 39747928723 in words is "thirty-nine billion, seven hundred forty-seven million, nine hundred twenty-eight thousand, seven hundred twenty-three".