39728305 has 4 divisors (see below), whose sum is σ = 47673972. Its totient is φ = 31782640.

The previous prime is 39728281. The next prime is 39728309. The reversal of 39728305 is 50382793.

39728305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23824161 + 15904144 = 4881^2 + 3988^2 .

It is not a de Polignac number, because 39728305 - 2¹¹ = 39726257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39728309) 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 3 ways as a sum of consecutive naturals, for example, 3972826 + ... + 3972835.

It is an arithmetic number, because the mean of its divisors is an integer number (11918493).

Almost surely, 2^39728305 is an apocalyptic number.

It is an amenable number.

39728305 is a deficient number, since it is larger than the sum of its proper divisors (7945667).

39728305 is an equidigital number, since it uses as much as digits as its factorization.

39728305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7945666.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 39728305 is about 6303.0393462202. The cubic root of 39728305 is about 341.2191096746.

The spelling of 39728305 in words is "thirty-nine million, seven hundred twenty-eight thousand, three hundred five".