1804105 has 4 divisors (see below), whose sum is σ = 2164932. Its totient is φ = 1443280.

The previous prime is 1804093. The next prime is 1804129. The reversal of 1804105 is 5014081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5014081 = 19 ⋅263899.

It can be written as a sum of positive squares in 2 ways, for example, as 219024 + 1585081 = 468^2 + 1259^2 .

It is not a de Polignac number, because 1804105 - 2⁵ = 1804073 is a prime.

It is a Duffinian number.

1804105 is a lucky 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, 180406 + ... + 180415.

It is an arithmetic number, because the mean of its divisors is an integer number (541233).

2^1804105 is an apocalyptic number.

It is an amenable number.

1804105 is a deficient number, since it is larger than the sum of its proper divisors (360827).

1804105 is an equidigital number, since it uses as much as digits as its factorization.

1804105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360826.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1804105 is about 1343.1697584446. The cubic root of 1804105 is about 121.7364417016.

Adding to 1804105 its reverse (5014081), we get a palindrome (6818186).

It can be divided in two parts, 1804 and 105, that multiplied together give a triangular number (189420 = T₆₁₅).

The spelling of 1804105 in words is "one million, eight hundred four thousand, one hundred five".