39139390644 has 24 divisors (see below), whose sum is σ = 93552691008. Its totient is φ = 12728256960.

The previous prime is 39139390637. The next prime is 39139390663. The reversal of 39139390644 is 44609393193.

39139390644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39775312 + ... + 39776295.

It is an arithmetic number, because the mean of its divisors is an integer number (3898028792).

Almost surely, 2^39139390644 is an apocalyptic number.

It is an amenable number.

39139390644 is an abundant number, since it is smaller than the sum of its proper divisors (54413300364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39139390644 is a wasteful number, since it uses less digits than its factorization.

39139390644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79551655 (or 79551653 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 51.

The spelling of 39139390644 in words is "thirty-nine billion, one hundred thirty-nine million, three hundred ninety thousand, six hundred forty-four".