1668056 has 32 divisors (see below), whose sum is σ = 3455760. Its totient is φ = 749952.

The previous prime is 1668053. The next prime is 1668061. The reversal of 1668056 is 6508661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4286 + ... + 4658.

2^1668056 is an apocalyptic number.

1668056 is the 746-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727880).

1668056 is an abundant number, since it is smaller than the sum of its proper divisors (1787704).

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

1668056 is a wasteful number, since it uses less digits than its factorization.

1668056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1668056 is about 1291.5324231315. The cubic root of 1668056 is about 118.5960457359.

The spelling of 1668056 in words is "one million, six hundred sixty-eight thousand, fifty-six".