1668684 has 24 divisors (see below), whose sum is σ = 3916528. Its totient is φ = 552960.

The previous prime is 1668683. The next prime is 1668721. The reversal of 1668684 is 4868661.

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668683) 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, 2604 + ... + 3180.

2^1668684 is an apocalyptic number.

It is an amenable number.

1668684 is an abundant number, since it is smaller than the sum of its proper divisors (2247844).

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

1668684 is a wasteful number, since it uses less digits than its factorization.

1668684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 823 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 1668684 is about 1291.7755222948. The cubic root of 1668684 is about 118.6109271251.

The spelling of 1668684 in words is "one million, six hundred sixty-eight thousand, six hundred eighty-four".