39945673138 has 16 divisors (see below), whose sum is σ = 69770341440. Its totient is φ = 16796563056.

The previous prime is 39945673127. The next prime is 39945673139. The reversal of 39945673138 is 83137654993.

39945673138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (39945673139) 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, 26916828 + ... + 26918311.

It is an arithmetic number, because the mean of its divisors is an integer number (4360646340).

Almost surely, 2^39945673138 is an apocalyptic number.

39945673138 is a deficient number, since it is larger than the sum of its proper divisors (29824668302).

39945673138 is a wasteful number, since it uses less digits than its factorization.

39945673138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53835201.

The product of its digits is 14696640, while the sum is 58.

The spelling of 39945673138 in words is "thirty-nine billion, nine hundred forty-five million, six hundred seventy-three thousand, one hundred thirty-eight".