819990023 has 2 divisors, whose sum is σ = 819990024. Its totient is φ = 819990022.

The previous prime is 819990007. The next prime is 819990077. The reversal of 819990023 is 320099918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 819990023 - 2⁴ = 819990007 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819995023) 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, 409995011 + 409995012.

It is an arithmetic number, because the mean of its divisors is an integer number (409995012).

Almost surely, 2^819990023 is an apocalyptic number.

819990023 is a deficient number, since it is larger than the sum of its proper divisors (1).

819990023 is an equidigital number, since it uses as much as digits as its factorization.

819990023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 819990023 is about 28635.4679200463. The cubic root of 819990023 is about 935.9863662118.

The spelling of 819990023 in words is "eight hundred nineteen million, nine hundred ninety thousand, twenty-three".