1820816923 has 2 divisors, whose sum is σ = 1820816924. Its totient is φ = 1820816922.

The previous prime is 1820816891. The next prime is 1820816969. The reversal of 1820816923 is 3296180281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1820816923 - 2⁵ = 1820816891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1820816993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910408461 + 910408462.

It is an arithmetic number, because the mean of its divisors is an integer number (910408462).

Almost surely, 2^1820816923 is an apocalyptic number.

1820816923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820816923 is an equidigital number, since it uses as much as digits as its factorization.

1820816923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1820816923 is about 42671.0314264842. The cubic root of 1820816923 is about 1221.1117973493. Note that the first 3 decimals are identical.

The spelling of 1820816923 in words is "one billion, eight hundred twenty million, eight hundred sixteen thousand, nine hundred twenty-three".