1385666 has 8 divisors (see below), whose sum is σ = 2083644. Its totient is φ = 691120.

The previous prime is 1385647. The next prime is 1385693. The reversal of 1385666 is 6665831.

It can be written as a sum of positive squares in 2 ways, for example, as 1380625 + 5041 = 1175^2 + 71^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776 + ... + 1836.

2^1385666 is an apocalyptic number.

1385666 is a deficient number, since it is larger than the sum of its proper divisors (697978).

1385666 is a wasteful number, since it uses less digits than its factorization.

1385666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716.

The product of its digits is 25920, while the sum is 35.

The square root of 1385666 is about 1177.1431518724. The cubic root of 1385666 is about 111.4857911875.

The spelling of 1385666 in words is "one million, three hundred eighty-five thousand, six hundred sixty-six".