1683666 has 40 divisors (see below), whose sum is σ = 3978480. Its totient is φ = 530712.

The previous prime is 1683637. The next prime is 1683667. The reversal of 1683666 is 6663861.

It is a d-powerful number, because it can be written as 1 + 6³ + 8³ + 3⁶ + 6⁴ + 6⁴ + 6⁸ .

It is a self number, because there is not a number n which added to its sum of digits gives 1683666.

It is not an unprimeable number, because it can be changed into a prime (1683667) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2805 + ... + 3351.

It is an arithmetic number, because the mean of its divisors is an integer number (99462).

2^1683666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1683666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989240).

1683666 is an abundant number, since it is smaller than the sum of its proper divisors (2294814).

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

1683666 is a wasteful number, since it uses less digits than its factorization.

1683666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 571 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1683666 is about 1297.5615592333. The cubic root of 1683666 is about 118.9648461471.

The spelling of 1683666 in words is "one million, six hundred eighty-three thousand, six hundred sixty-six".