It is a semiprime because it is the product of two primes.
It is a self number, because there is not a number n which added to its sum of digits gives 1666094.
It is a congruent number.
It is an unprimeable number.
21666094 is an apocalyptic number.
1666094 is an equidigital number, since it uses as much as digits as its factorization.
1666094 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 833049.
The square root of 1666094 is about 1290.7726368342. The cubic root of 1666094 is about 118.5495291659.
The spelling of 1666094 in words is "one million, six hundred sixty-six thousand, ninety-four".