39728281 has 2 divisors, whose sum is σ = 39728282. Its totient is φ = 39728280.

The previous prime is 39728261. The next prime is 39728309. The reversal of 39728281 is 18282793.

39728281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37711881 + 2016400 = 6141^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 39728281 - 2⁹ = 39727769 is a prime.

It is a super-2 number, since 2×39728281² = 3156672622429922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39728261) 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 as a sum of consecutive naturals, namely, 19864140 + 19864141.

It is an arithmetic number, because the mean of its divisors is an integer number (19864141).

Almost surely, 2^39728281 is an apocalyptic number.

It is an amenable number.

39728281 is a deficient number, since it is larger than the sum of its proper divisors (1).

39728281 is an equidigital number, since it uses as much as digits as its factorization.

39728281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 39728281 is about 6303.0374423765. The cubic root of 39728281 is about 341.2190409641.

The spelling of 39728281 in words is "thirty-nine million, seven hundred twenty-eight thousand, two hundred eighty-one".