13857666 has 16 divisors (see below), whose sum is σ = 27842304. Its totient is φ = 4598064.

The previous prime is 13857637. The next prime is 13857667. The reversal of 13857666 is 66675831.

13857666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (13857667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3841 + ... + 6516.

It is an arithmetic number, because the mean of its divisors is an integer number (1740144).

Almost surely, 2^13857666 is an apocalyptic number.

13857666 is an abundant number, since it is smaller than the sum of its proper divisors (13984638).

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

13857666 is a wasteful number, since it uses less digits than its factorization.

13857666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10585.

The product of its digits is 181440, while the sum is 42.

The square root of 13857666 is about 3722.5886154664. The cubic root of 13857666 is about 240.1946684470.

The spelling of 13857666 in words is "thirteen million, eight hundred fifty-seven thousand, six hundred sixty-six".