39723716638 has 16 divisors (see below), whose sum is σ = 63417513600. Its totient is φ = 18596653056.

The previous prime is 39723716633. The next prime is 39723716693. The reversal of 39723716638 is 83661732793.

It is a super-2 number, since 2×39723716638² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39723716633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3020238 + ... + 3033361.

It is an arithmetic number, because the mean of its divisors is an integer number (3963594600).

Almost surely, 2^39723716638 is an apocalyptic number.

39723716638 is a deficient number, since it is larger than the sum of its proper divisors (23693796962).

39723716638 is a wasteful number, since it uses less digits than its factorization.

39723716638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6053811.

The product of its digits is 6858432, while the sum is 55.

The spelling of 39723716638 in words is "thirty-nine billion, seven hundred twenty-three million, seven hundred sixteen thousand, six hundred thirty-eight".