39638579923 has 4 divisors (see below), whose sum is σ = 39639004200. Its totient is φ = 39638155648.

The previous prime is 39638579921. The next prime is 39638579933. The reversal of 39638579923 is 32997583693.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 39638579923 - 2¹ = 39638579921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39638579921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3790 + ... + 281587.

It is an arithmetic number, because the mean of its divisors is an integer number (9909751050).

Almost surely, 2^39638579923 is an apocalyptic number.

39638579923 is a deficient number, since it is larger than the sum of its proper divisors (424277).

39638579923 is a wasteful number, since it uses less digits than its factorization.

39638579923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424276.

The product of its digits is 66134880, while the sum is 64.

The spelling of 39638579923 in words is "thirty-nine billion, six hundred thirty-eight million, five hundred seventy-nine thousand, nine hundred twenty-three".