39688841 has 2 divisors, whose sum is σ = 39688842. Its totient is φ = 39688840.

The previous prime is 39688807. The next prime is 39688843. The reversal of 39688841 is 14888693.

39688841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23001616 + 16687225 = 4796^2 + 4085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39688841 is a prime.

Together with 39688843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39688843) 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, 19844420 + 19844421.

It is an arithmetic number, because the mean of its divisors is an integer number (19844421).

Almost surely, 2^39688841 is an apocalyptic number.

It is an amenable number.

39688841 is a deficient number, since it is larger than the sum of its proper divisors (1).

39688841 is an equidigital number, since it uses as much as digits as its factorization.

39688841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 47.

The square root of 39688841 is about 6299.9080152015. The cubic root of 39688841 is about 341.1060892293.

The spelling of 39688841 in words is "thirty-nine million, six hundred eighty-eight thousand, eight hundred forty-one".