39716721 has 12 divisors (see below), whose sum is σ = 62584080. Its totient is φ = 24070680.

The previous prime is 39716713. The next prime is 39716723. The reversal of 39716721 is 12761793.

It is a happy number.

39716721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39716721 - 2³ = 39716713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39716723) 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 11 ways as a sum of consecutive naturals, for example, 200491 + ... + 200688.

It is an arithmetic number, because the mean of its divisors is an integer number (5215340).

Almost surely, 2^39716721 is an apocalyptic number.

It is an amenable number.

39716721 is a deficient number, since it is larger than the sum of its proper divisors (22867359).

39716721 is a wasteful number, since it uses less digits than its factorization.

39716721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401196 (or 401193 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 39716721 is about 6302.1203574670. The cubic root of 39716721 is about 341.1859421684.

The spelling of 39716721 in words is "thirty-nine million, seven hundred sixteen thousand, seven hundred twenty-one".