1089805 has 16 divisors (see below), whose sum is σ = 1382400. Its totient is φ = 823680.

The previous prime is 1089799. The next prime is 1089841. The reversal of 1089805 is 5089801.

It is not a de Polignac number, because 1089805 - 2⁷ = 1089677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12201 + ... + 12289.

It is an arithmetic number, because the mean of its divisors is an integer number (86400).

2^1089805 is an apocalyptic number.

It is an amenable number.

1089805 is a deficient number, since it is larger than the sum of its proper divisors (292595).

1089805 is an equidigital number, since it uses as much as digits as its factorization.

1089805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1089805 is about 1043.9372586511. The cubic root of 1089805 is about 102.9081092030.

The spelling of 1089805 in words is "one million, eighty-nine thousand, eight hundred five".