1006665 has 16 divisors (see below), whose sum is σ = 1757376. Its totient is φ = 488000.

The previous prime is 1006651. The next prime is 1006711. The reversal of 1006665 is 5666001.

It is not a de Polignac number, because 1006665 - 2⁵ = 1006633 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 2886 + ... + 3215.

It is an arithmetic number, because the mean of its divisors is an integer number (109836).

2^1006665 is an apocalyptic number.

1006665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1006665 is a deficient number, since it is larger than the sum of its proper divisors (750711).

1006665 is a wasteful number, since it uses less digits than its factorization.

1006665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6120.

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

The square root of 1006665 is about 1003.3269656498. The cubic root of 1006665 is about 100.2216749059.

The spelling of 1006665 in words is "one million, six thousand, six hundred sixty-five".