13643887 has 4 divisors (see below), whose sum is σ = 13653640. Its totient is φ = 13634136.

The previous prime is 13643879. The next prime is 13643921. The reversal of 13643887 is 78834631.

13643887 is digitally balanced in base 3, 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78834631 = 61 ⋅1292371.

It is a cyclic number.

It is not a de Polignac number, because 13643887 - 2³ = 13643879 is a prime.

It is a Duffinian number.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13643827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2337 + ... + 5722.

It is an arithmetic number, because the mean of its divisors is an integer number (3413410).

Almost surely, 2^13643887 is an apocalyptic number.

13643887 is a deficient number, since it is larger than the sum of its proper divisors (9753).

13643887 is an equidigital number, since it uses as much as digits as its factorization.

13643887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9752.

The product of its digits is 96768, while the sum is 40.

The square root of 13643887 is about 3693.7632571674. The cubic root of 13643887 is about 238.9531195433.

The spelling of 13643887 in words is "thirteen million, six hundred forty-three thousand, eight hundred eighty-seven".