39391487944 has 8 divisors (see below), whose sum is σ = 73859039910. Its totient is φ = 19695743968.

The previous prime is 39391487939. The next prime is 39391487953. The reversal of 39391487944 is 44978419393.

It can be written as a sum of positive squares in only one way, i.e., 33255899044 + 6135588900 = 182362^2 + 78330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2461967989 + ... + 2461968004.

Almost surely, 2^39391487944 is an apocalyptic number.

It is an amenable number.

39391487944 is a deficient number, since it is larger than the sum of its proper divisors (34467551966).

39391487944 is a wasteful number, since it uses less digits than its factorization.

39391487944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4923935999 (or 4923935995 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 61.

The spelling of 39391487944 in words is "thirty-nine billion, three hundred ninety-one million, four hundred eighty-seven thousand, nine hundred forty-four".