1705666 has 4 divisors (see below), whose sum is σ = 2558502.
Its totient is φ = 852832.
The previous prime is 1705637. The next prime is 1705667. The reversal of 1705666 is 6665071.
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., 1476225 + 229441 = 1215^2 + 479^2
It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is not an unprimeable number, because it can be changed into a prime (1705667) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426415 + ... + 426418.
21705666 is an apocalyptic number.
1705666 is a deficient number, since it is larger than the sum of its proper divisors (852836).
1705666 is an equidigital number, since it uses as much as digits as its factorization.
1705666 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 852835.
The product of its (nonzero) digits is 7560, while the sum is 31.
The square root of 1705666 is about 1306.0114854013.
The cubic root of 1705666 is about 119.4807657984.
The spelling of 1705666 in words is "one million, seven hundred five thousand, six hundred sixty-six".