1666386 has 16 divisors (see below), whose sum is σ = 3703200. Its totient is φ = 555444.

The previous prime is 1666361. The next prime is 1666387. The reversal of 1666386 is 6836661.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1666386.

It is not an unprimeable number, because it can be changed into a prime (1666387) 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 7 ways as a sum of consecutive naturals, for example, 15376 + ... + 15483.

It is an arithmetic number, because the mean of its divisors is an integer number (231450).

2^1666386 is an apocalyptic number.

1666386 is an abundant number, since it is smaller than the sum of its proper divisors (2036814).

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

1666386 is a wasteful number, since it uses less digits than its factorization.

1666386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30870 (or 30864 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1666386 is about 1290.8857424265. The cubic root of 1666386 is about 118.5564544335.

The spelling of 1666386 in words is "one million, six hundred sixty-six thousand, three hundred eighty-six".