1823005 has 4 divisors (see below), whose sum is σ = 2187612. Its totient is φ = 1458400.

The previous prime is 1822999. The next prime is 1823009. The reversal of 1823005 is 5003281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5003281 = 61 ⋅82021.

It can be written as a sum of positive squares in 2 ways, for example, as 432964 + 1390041 = 658^2 + 1179^2 .

It is not a de Polignac number, because 1823005 - 2⁹ = 1822493 is a prime.

It is a Duffinian number.

1823005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1823009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182296 + ... + 182305.

It is an arithmetic number, because the mean of its divisors is an integer number (546903).

2^1823005 is an apocalyptic number.

It is an amenable number.

1823005 is a deficient number, since it is larger than the sum of its proper divisors (364607).

1823005 is an equidigital number, since it uses as much as digits as its factorization.

1823005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364606.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1823005 is about 1350.1870240822. The cubic root of 1823005 is about 122.1600738522.

Adding to 1823005 its reverse (5003281), we get a palindrome (6826286).

The spelling of 1823005 in words is "one million, eight hundred twenty-three thousand, five".