39909917 has 2 divisors, whose sum is σ = 39909918. Its totient is φ = 39909916.

The previous prime is 39909913. The next prime is 39909943. The reversal of 39909917 is 71990993.

It is a happy number.

39909917 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., 28847641 + 11062276 = 5371^2 + 3326^2 .

It is a cyclic number.

It is not a de Polignac number, because 39909917 - 2² = 39909913 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39909911) 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, 19954958 + 19954959.

It is an arithmetic number, because the mean of its divisors is an integer number (19954959).

Almost surely, 2^39909917 is an apocalyptic number.

It is an amenable number.

39909917 is a deficient number, since it is larger than the sum of its proper divisors (1).

39909917 is an equidigital number, since it uses as much as digits as its factorization.

39909917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 39909917 is about 6317.4296197109. The cubic root of 39909917 is about 341.7382634279.

The spelling of 39909917 in words is "thirty-nine million, nine hundred nine thousand, nine hundred seventeen".