1000805 has 16 divisors (see below), whose sum is σ = 1315440. Its totient is φ = 726528.

The previous prime is 1000793. The next prime is 1000829. The reversal of 1000805 is 5080001.

It can be written as a sum of positive squares in 8 ways, for example, as 36481 + 964324 = 191^2 + 982^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000805 - 2¹⁴ = 984421 is a prime.

It is a super-2 number, since 2×1000805² = 2003221296050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000805.

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 15 ways as a sum of consecutive naturals, for example, 5699 + ... + 5871.

It is an arithmetic number, because the mean of its divisors is an integer number (82215).

2^1000805 is an apocalyptic number.

It is an amenable number.

1000805 is a deficient number, since it is larger than the sum of its proper divisors (314635).

1000805 is a wasteful number, since it uses less digits than its factorization.

1000805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1000805 is about 1000.4024190295. The cubic root of 1000805 is about 100.0268261363.

Adding to 1000805 its reverse (5080001), we get a palindrome (6080806).

The spelling of 1000805 in words is "one million, eight hundred five", and thus it is an aban number.