1813005 has 12 divisors (see below), whose sum is σ = 3142620. Its totient is φ = 966912.

The previous prime is 1813003. The next prime is 1813039. The reversal of 1813005 is 5003181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1320201 + 492804 = 1149^2 + 702^2 .

It is not a de Polignac number, because 1813005 - 2¹ = 1813003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813001) 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 11 ways as a sum of consecutive naturals, for example, 20100 + ... + 20189.

It is an arithmetic number, because the mean of its divisors is an integer number (261885).

2^1813005 is an apocalyptic number.

1813005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1813005 is a deficient number, since it is larger than the sum of its proper divisors (1329615).

1813005 is a wasteful number, since it uses less digits than its factorization.

1813005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40300 (or 40297 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1813005 is about 1346.4787410130. The cubic root of 1813005 is about 121.9362965821.

Adding to 1813005 its reverse (5003181), we get a palindrome (6816186).

The spelling of 1813005 in words is "one million, eight hundred thirteen thousand, five".