1800823 has 2 divisors, whose sum is σ = 1800824. Its totient is φ = 1800822.

The previous prime is 1800811. The next prime is 1800829. The reversal of 1800823 is 3280081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1800823 - 2⁹ = 1800311 is a prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1800794 and 1800803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900411 + 900412.

It is an arithmetic number, because the mean of its divisors is an integer number (900412).

2^1800823 is an apocalyptic number.

1800823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800823 is an equidigital number, since it uses as much as digits as its factorization.

1800823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1800823 is about 1341.9474654397. The cubic root of 1800823 is about 121.6625765394.

The spelling of 1800823 in words is "one million, eight hundred thousand, eight hundred twenty-three".