1818805 has 4 divisors (see below), whose sum is σ = 2182572. Its totient is φ = 1455040.

The previous prime is 1818799. The next prime is 1818833. The reversal of 1818805 is 5088181.

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 879844 + 938961 = 938^2 + 969^2 .

It is not a de Polignac number, because 1818805 - 2⁹ = 1818293 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 181876 + ... + 181885.

It is an arithmetic number, because the mean of its divisors is an integer number (545643).

2^1818805 is an apocalyptic number.

It is an amenable number.

1818805 is a deficient number, since it is larger than the sum of its proper divisors (363767).

1818805 is an equidigital number, since it uses as much as digits as its factorization.

1818805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363766.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 1818805 is about 1348.6307871319. The cubic root of 1818805 is about 122.0661873231.

The spelling of 1818805 in words is "one million, eight hundred eighteen thousand, eight hundred five".