39728947 has 4 divisors (see below), whose sum is σ = 40652920. Its totient is φ = 38804976.

The previous prime is 39728939. The next prime is 39728971. The reversal of 39728947 is 74982793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74982793 = 587 ⋅127739.

It is a cyclic number.

It is not a de Polignac number, because 39728947 - 2³ = 39728939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39728947.

It is not an unprimeable number, because it can be changed into a prime (39728917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461922 + ... + 462007.

It is an arithmetic number, because the mean of its divisors is an integer number (10163230).

Almost surely, 2^39728947 is an apocalyptic number.

39728947 is a deficient number, since it is larger than the sum of its proper divisors (923973).

39728947 is an equidigital number, since it uses as much as digits as its factorization.

39728947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923972.

The product of its digits is 762048, while the sum is 49.

The square root of 39728947 is about 6303.0902738260. The cubic root of 39728947 is about 341.2209476714.

The spelling of 39728947 in words is "thirty-nine million, seven hundred twenty-eight thousand, nine hundred forty-seven".