1085209 has 8 divisors (see below), whose sum is σ = 1172160. Its totient is φ = 1001616.

The previous prime is 1085197. The next prime is 1085221. The reversal of 1085209 is 9025801.

It is an interprime number because it is at equal distance from previous prime (1085197) and next prime (1085221).

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

It is a cyclic number.

It is not a de Polignac number, because 1085209 - 2⁹ = 1084697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1085269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147 + ... + 1480.

It is an arithmetic number, because the mean of its divisors is an integer number (146520).

2^1085209 is an apocalyptic number.

It is an amenable number.

1085209 is a deficient number, since it is larger than the sum of its proper divisors (86951).

1085209 is a wasteful number, since it uses less digits than its factorization.

1085209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1085209 is about 1041.7336511796. The cubic root of 1085209 is about 102.7632416636.

The spelling of 1085209 in words is "one million, eighty-five thousand, two hundred nine".