1806085 has 4 divisors (see below), whose sum is σ = 2167308. Its totient is φ = 1444864.

The previous prime is 1806061. The next prime is 1806089. The reversal of 1806085 is 5806081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1435204 + 370881 = 1198^2 + 609^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806085 - 2¹¹ = 1804037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806089) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 180604 + ... + 180613.

It is an arithmetic number, because the mean of its divisors is an integer number (541827).

2^1806085 is an apocalyptic number.

It is an amenable number.

1806085 is a deficient number, since it is larger than the sum of its proper divisors (361223).

1806085 is an equidigital number, since it uses as much as digits as its factorization.

1806085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361222.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 1806085 is about 1343.9066187797. The cubic root of 1806085 is about 121.7809605495.

It can be divided in two parts, 18060 and 85, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 1806085 in words is "one million, eight hundred six thousand, eighty-five".