39971557538 has 16 divisors (see below), whose sum is σ = 68251830336. Its totient is φ = 17378937840.

The previous prime is 39971557519. The next prime is 39971557583. The reversal of 39971557538 is 83575517993.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39497081 + ... + 39498092.

It is an arithmetic number, because the mean of its divisors is an integer number (4265739396).

Almost surely, 2^39971557538 is an apocalyptic number.

39971557538 is a deficient number, since it is larger than the sum of its proper divisors (28280272798).

39971557538 is a wasteful number, since it uses less digits than its factorization.

39971557538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78995209.

The product of its digits is 35721000, while the sum is 62.

The spelling of 39971557538 in words is "thirty-nine billion, nine hundred seventy-one million, five hundred fifty-seven thousand, five hundred thirty-eight".