1660806 has 48 divisors (see below), whose sum is σ = 4212000. Its totient is φ = 472752.

The previous prime is 1660793. The next prime is 1660837. The reversal of 1660806 is 6080661.

It is a self number, because there is not a number n which added to its sum of digits gives 1660806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6040 + ... + 6308.

It is an arithmetic number, because the mean of its divisors is an integer number (87750).

2^1660806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2106000).

1660806 is an abundant number, since it is smaller than the sum of its proper divisors (2551194).

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

1660806 is a wasteful number, since it uses less digits than its factorization.

1660806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1660806 is about 1288.7226233756. The cubic root of 1660806 is about 118.4239751637.

The spelling of 1660806 in words is "one million, six hundred sixty thousand, eight hundred six".