1856664 has 48 divisors (see below), whose sum is σ = 5096520. Its totient is φ = 610560.

The previous prime is 1856651. The next prime is 1856713. The reversal of 1856664 is 4666581.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (34560) is a multiple of the sum of its prime factors (360).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7584 + ... + 7824.

2^1856664 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 1856664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2548260).

1856664 is an abundant number, since it is smaller than the sum of its proper divisors (3239856).

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

1856664 is a wasteful number, since it uses less digits than its factorization.

1856664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 353 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1856664 is about 1362.5945838730. The cubic root of 1856664 is about 122.9073265845.

The spelling of 1856664 in words is "one million, eight hundred fifty-six thousand, six hundred sixty-four".