1680706 has 4 divisors (see below), whose sum is σ = 2521062. Its totient is φ = 840352.

The previous prime is 1680703. The next prime is 1680709. The reversal of 1680706 is 6070861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6070861 = 19 ⋅319519.

It is an interprime number because it is at equal distance from previous prime (1680703) and next prime (1680709).

It can be written as a sum of positive squares in only one way, i.e., 1540081 + 140625 = 1241^2 + 375^2 .

It is not an unprimeable number, because it can be changed into a prime (1680703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420175 + ... + 420178.

2^1680706 is an apocalyptic number.

1680706 is a deficient number, since it is larger than the sum of its proper divisors (840356).

1680706 is an equidigital number, since it uses as much as digits as its factorization.

1680706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840355.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1680706 is about 1296.4204564878. The cubic root of 1680706 is about 118.8950891394.

The spelling of 1680706 in words is "one million, six hundred eighty thousand, seven hundred six".