13887666 has 64 divisors (see below), whose sum is σ = 33815040. Its totient is φ = 4199040.

The previous prime is 13887641. The next prime is 13887677. The reversal of 13887666 is 66678831.

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 31 ways as a sum of consecutive naturals, for example, 51111 + ... + 51381.

It is an arithmetic number, because the mean of its divisors is an integer number (528360).

Almost surely, 2^13887666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13887666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16907520).

13887666 is an abundant number, since it is smaller than the sum of its proper divisors (19927374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13887666 is a wasteful number, since it uses less digits than its factorization.

13887666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 362 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 13887666 is about 3726.6158911270. The cubic root of 13887666 is about 240.3678733336.

The spelling of 13887666 in words is "thirteen million, eight hundred eighty-seven thousand, six hundred sixty-six".