39789991605 has 192 divisors, whose sum is σ = 83626518528. Its totient is φ = 15982686720.

The previous prime is 39789991601. The next prime is 39789991639. The reversal of 39789991605 is 50619998793.

39789991605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39789991605 - 2² = 39789991601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39789991601) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 72741942 + ... + 72742488.

It is an arithmetic number, because the mean of its divisors is an integer number (435554784).

Almost surely, 2^39789991605 is an apocalyptic number.

39789991605 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39789991605 is an abundant number, since it is smaller than the sum of its proper divisors (43836526923).

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

39789991605 is a wasteful number, since it uses less digits than its factorization.

39789991605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 33067440, while the sum is 66.

The spelling of 39789991605 in words is "thirty-nine billion, seven hundred eighty-nine million, nine hundred ninety-one thousand, six hundred five".