39385909728 has 144 divisors (see below), whose sum is σ = 124257369600. Its totient is φ = 11732778240.

The previous prime is 39385909721. The next prime is 39385909741. The reversal of 39385909728 is 82790958393.

39385909728 is a `hidden beast` number, since 3 + 9 + 38 + 590 + 9 + 7 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39385909721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81553 + ... + 292271.

It is an arithmetic number, because the mean of its divisors is an integer number (862898400).

Almost surely, 2^39385909728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39385909728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62128684800).

39385909728 is an abundant number, since it is smaller than the sum of its proper divisors (84871459872).

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

39385909728 is a wasteful number, since it uses less digits than its factorization.

39385909728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210805 (or 210794 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 39385909728 in words is "thirty-nine billion, three hundred eighty-five million, nine hundred nine thousand, seven hundred twenty-eight".