13939805 has 12 divisors (see below), whose sum is σ = 18387516. Its totient is φ = 10137600.

The previous prime is 13939769. The next prime is 13939831. The reversal of 13939805 is 50893931.

It can be written as a sum of positive squares in 2 ways, for example, as 3833764 + 10106041 = 1958^2 + 3179^2 .

It is not a de Polignac number, because 13939805 - 2⁶ = 13939741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 10916 + ... + 12125.

It is an arithmetic number, because the mean of its divisors is an integer number (1532293).

Almost surely, 2^13939805 is an apocalyptic number.

It is an amenable number.

13939805 is a deficient number, since it is larger than the sum of its proper divisors (4447711).

13939805 is a wasteful number, since it uses less digits than its factorization.

13939805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23068 (or 23057 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 13939805 is about 3733.6048264378. The cubic root of 13939805 is about 240.6683051311.

The spelling of 13939805 in words is "thirteen million, nine hundred thirty-nine thousand, eight hundred five".