13805993 has 4 divisors (see below), whose sum is σ = 13942788. Its totient is φ = 13669200.

The previous prime is 13805983. The next prime is 13806019. The reversal of 13805993 is 39950831.

13805993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10837264 + 2968729 = 3292^2 + 1723^2 .

It is a cyclic number.

It is not a de Polignac number, because 13805993 - 2⁴ = 13805977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13805903) 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, 68246 + ... + 68447.

It is an arithmetic number, because the mean of its divisors is an integer number (3485697).

Almost surely, 2^13805993 is an apocalyptic number.

It is an amenable number.

13805993 is a deficient number, since it is larger than the sum of its proper divisors (136795).

13805993 is a wasteful number, since it uses less digits than its factorization.

13805993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136794.

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

The square root of 13805993 is about 3715.6416673302. The cubic root of 13805993 is about 239.8957475449.

The spelling of 13805993 in words is "thirteen million, eight hundred five thousand, nine hundred ninety-three".