1005666 has 8 divisors (see below), whose sum is σ = 2011344. Its totient is φ = 335220.

The previous prime is 1005661. The next prime is 1005677. The reversal of 1005666 is 6665001.

1005666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

1005666 is an admirable number.

It is a super-2 number, since 2×1005666² = 2022728207112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1005661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83800 + ... + 83811.

It is an arithmetic number, because the mean of its divisors is an integer number (251418).

2^1005666 is an apocalyptic number.

1005666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1005666 is a wasteful number, since it uses less digits than its factorization.

1005666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167616.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1005666 is about 1002.8289983841. The cubic root of 1005666 is about 100.1885110791.

The spelling of 1005666 in words is "one million, five thousand, six hundred sixty-six".