1666746 has 48 divisors (see below), whose sum is σ = 3893760. Its totient is φ = 514080.

The previous prime is 1666733. The next prime is 1666757. The reversal of 1666746 is 6476661.

Its product of digits (36288) is a multiple of the sum of its prime divisors (168).

It is a self number, because there is not a number n which added to its sum of digits gives 1666746.

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 23 ways as a sum of consecutive naturals, for example, 16131 + ... + 16233.

It is an arithmetic number, because the mean of its divisors is an integer number (81120).

2^1666746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1946880).

1666746 is an abundant number, since it is smaller than the sum of its proper divisors (2227014).

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

1666746 is a wasteful number, since it uses less digits than its factorization.

1666746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 168 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 1666746 is about 1291.0251740381. The cubic root of 1666746 is about 118.5649913212.

The spelling of 1666746 in words is "one million, six hundred sixty-six thousand, seven hundred forty-six".