39115728 has 30 divisors (see below), whose sum is σ = 109470114. Its totient is φ = 13038528.

The previous prime is 39115721. The next prime is 39115733. The reversal of 39115728 is 82751193.

39115728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 39087504 + 28224 = 6252^2 + 168^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 39115692 and 39115701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39115721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 135675 + ... + 135962.

Almost surely, 2^39115728 is an apocalyptic number.

It is an amenable number.

39115728 is an abundant number, since it is smaller than the sum of its proper divisors (70354386).

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

39115728 is a wasteful number, since it uses less digits than its factorization.

39115728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271651 (or 271642 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 39115728 is about 6254.2567903789. The cubic root of 39115728 is about 339.4562473486.

The spelling of 39115728 in words is "thirty-nine million, one hundred fifteen thousand, seven hundred twenty-eight".