1686680 has 32 divisors (see below), whose sum is σ = 3834000. Its totient is φ = 667776.

The previous prime is 1686677. The next prime is 1686683. The reversal of 1686680 is 866861.

It is an interprime number because it is at equal distance from previous prime (1686677) and next prime (1686683).

It is a self number, because there is not a number n which added to its sum of digits gives 1686680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686683) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 5819 + ... + 6101.

2^1686680 is an apocalyptic number.

1686680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686680 is an abundant number, since it is smaller than the sum of its proper divisors (2147320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686680 is a wasteful number, since it uses less digits than its factorization.

1686680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1686680 is about 1298.7224491784. The cubic root of 1686680 is about 119.0357917901.

The spelling of 1686680 in words is "one million, six hundred eighty-six thousand, six hundred eighty".