1686668 has 12 divisors (see below), whose sum is σ = 3107160. Its totient is φ = 798912.

The previous prime is 1686667. The next prime is 1686673. The reversal of 1686668 is 8666861.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1686661) 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 3 ways as a sum of consecutive naturals, for example, 11021 + ... + 11172.

It is an arithmetic number, because the mean of its divisors is an integer number (258930).

2^1686668 is an apocalyptic number.

It is an amenable number.

1686668 is a deficient number, since it is larger than the sum of its proper divisors (1420492).

1686668 is a wasteful number, since it uses less digits than its factorization.

1686668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22216 (or 22214 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 1686668 is about 1298.7178292454. The cubic root of 1686668 is about 119.0355094933.

The spelling of 1686668 in words is "one million, six hundred eighty-six thousand, six hundred sixty-eight".