1666706 has 4 divisors (see below), whose sum is σ = 2500062. Its totient is φ = 833352.

The previous prime is 1666657. The next prime is 1666711. The reversal of 1666706 is 6076661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1666681 + 25 = 1291^2 + 5^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 416675 + ... + 416678.

2^1666706 is an apocalyptic number.

1666706 is a deficient number, since it is larger than the sum of its proper divisors (833356).

1666706 is an equidigital number, since it uses as much as digits as its factorization.

1666706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833355.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1666706 is about 1291.0096823804. The cubic root of 1666706 is about 118.5640428388.

The spelling of 1666706 in words is "one million, six hundred sixty-six thousand, seven hundred six".