1812823 has 2 divisors, whose sum is σ = 1812824. Its totient is φ = 1812822.

The previous prime is 1812821. The next prime is 1812827. The reversal of 1812823 is 3282181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1812823 - 2¹ = 1812821 is a prime.

Together with 1812821, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906411 + 906412.

It is an arithmetic number, because the mean of its divisors is an integer number (906412).

2^1812823 is an apocalyptic number.

1812823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812823 is an equidigital number, since it uses as much as digits as its factorization.

1812823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 1812823 is about 1346.4111556282. The cubic root of 1812823 is about 121.9322162204.

The spelling of 1812823 in words is "one million, eight hundred twelve thousand, eight hundred twenty-three".