1668856 has 32 divisors (see below), whose sum is σ = 3788640. Its totient is φ = 672768.

The previous prime is 1668847. The next prime is 1668869. The reversal of 1668856 is 6588661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 1828.

It is an arithmetic number, because the mean of its divisors is an integer number (118395).

2^1668856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1894320).

1668856 is an abundant number, since it is smaller than the sum of its proper divisors (2119784).

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

1668856 is a wasteful number, since it uses less digits than its factorization.

1668856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783 (or 1779 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 1668856 is about 1291.8420956139. The cubic root of 1668856 is about 118.6150022683.

The spelling of 1668856 in words is "one million, six hundred sixty-eight thousand, eight hundred fifty-six".