13666385 has 8 divisors (see below), whose sum is σ = 17364456. Its totient is φ = 10289920.

The previous prime is 13666369. The next prime is 13666391. The reversal of 13666385 is 58366631.

It can be written as a sum of positive squares in 4 ways, for example, as 2430481 + 11235904 = 1559^2 + 3352^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13666385 - 2⁴ = 13666369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80306 + ... + 80475.

It is an arithmetic number, because the mean of its divisors is an integer number (2170557).

Almost surely, 2^13666385 is an apocalyptic number.

It is an amenable number.

13666385 is a deficient number, since it is larger than the sum of its proper divisors (3698071).

13666385 is a wasteful number, since it uses less digits than its factorization.

13666385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160803.

The product of its digits is 77760, while the sum is 38.

The square root of 13666385 is about 3696.8074063981. The cubic root of 13666385 is about 239.0843874901.

The spelling of 13666385 in words is "thirteen million, six hundred sixty-six thousand, three hundred eighty-five".