1823813 has 2 divisors, whose sum is σ = 1823814. Its totient is φ = 1823812.

The previous prime is 1823797. The next prime is 1823827. The reversal of 1823813 is 3183281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1803649 + 20164 = 1343^2 + 142^2 .

It is a cyclic number.

It is not a de Polignac number, because 1823813 - 2⁴ = 1823797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1823863) 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 as a sum of consecutive naturals, namely, 911906 + 911907.

It is an arithmetic number, because the mean of its divisors is an integer number (911907).

2^1823813 is an apocalyptic number.

It is an amenable number.

1823813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1823813 is an equidigital number, since it uses as much as digits as its factorization.

1823813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 1823813 is about 1350.4862087411. The cubic root of 1823813 is about 122.1781192882.

The spelling of 1823813 in words is "one million, eight hundred twenty-three thousand, eight hundred thirteen".