1805345 has 4 divisors (see below), whose sum is σ = 2166420. Its totient is φ = 1444272.

The previous prime is 1805327. The next prime is 1805357. The reversal of 1805345 is 5435081.

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 839056 + 966289 = 916^2 + 983^2 .

It is a cyclic number.

It is not a de Polignac number, because 1805345 - 2¹⁰ = 1804321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180530 + ... + 180539.

It is an arithmetic number, because the mean of its divisors is an integer number (541605).

2^1805345 is an apocalyptic number.

It is an amenable number.

1805345 is a deficient number, since it is larger than the sum of its proper divisors (361075).

1805345 is an equidigital number, since it uses as much as digits as its factorization.

1805345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361074.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1805345 is about 1343.6312738248. The cubic root of 1805345 is about 121.7643260018.

The spelling of 1805345 in words is "one million, eight hundred five thousand, three hundred forty-five".