13888705 has 4 divisors (see below), whose sum is σ = 16666452. Its totient is φ = 11110960.

The previous prime is 13888669. The next prime is 13888723. The reversal of 13888705 is 50788831.

13888705 = 1174² + 1175² + ... + 1183².

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 9628609 + 4260096 = 3103^2 + 2064^2 .

It is not a de Polignac number, because 13888705 - 2⁷ = 13888577 is a prime.

It is a super-2 number, since 2×13888705² = 385792253154050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1388866 + ... + 1388875.

It is an arithmetic number, because the mean of its divisors is an integer number (4166613).

Almost surely, 2^13888705 is an apocalyptic number.

It is an amenable number.

13888705 is a deficient number, since it is larger than the sum of its proper divisors (2777747).

13888705 is an equidigital number, since it uses as much as digits as its factorization.

13888705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777746.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 13888705 is about 3726.7552911346. The cubic root of 13888705 is about 240.3738675252.

The spelling of 13888705 in words is "thirteen million, eight hundred eighty-eight thousand, seven hundred five".