1706665 has 4 divisors (see below), whose sum is σ = 2048004. Its totient is φ = 1365328.

The previous prime is 1706659. The next prime is 1706687. The reversal of 1706665 is 5666071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5666071 = 53 ⋅106907.

It can be written as a sum of positive squares in 2 ways, for example, as 1272384 + 434281 = 1128^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1706665 - 2³ = 1706657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170662 + ... + 170671.

It is an arithmetic number, because the mean of its divisors is an integer number (512001).

2^1706665 is an apocalyptic number.

It is an amenable number.

1706665 is a deficient number, since it is larger than the sum of its proper divisors (341339).

1706665 is an equidigital number, since it uses as much as digits as its factorization.

1706665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341338.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1706665 is about 1306.3938915963. The cubic root of 1706665 is about 119.5040876738.

The spelling of 1706665 in words is "one million, seven hundred six thousand, six hundred sixty-five".