1666285 has 8 divisors (see below), whose sum is σ = 2013696. Its totient is φ = 1323600.

The previous prime is 1666279. The next prime is 1666297. The reversal of 1666285 is 5826661.

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

It is a de Polignac number, because none of the positive numbers 2^k-1666285 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666285.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 349 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (251712).

2^1666285 is an apocalyptic number.

It is an amenable number.

1666285 is a deficient number, since it is larger than the sum of its proper divisors (347411).

1666285 is a wasteful number, since it uses less digits than its factorization.

1666285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363.

The product of its digits is 17280, while the sum is 34.

The square root of 1666285 is about 1290.8466214078. The cubic root of 1666285 is about 118.5540591413.

The spelling of 1666285 in words is "one million, six hundred sixty-six thousand, two hundred eighty-five".