19799623 has 2 divisors, whose sum is σ = 19799624. Its totient is φ = 19799622.

The previous prime is 19799617. The next prime is 19799627. The reversal of 19799623 is 32699791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19799623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19799627) 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, 9899811 + 9899812.

It is an arithmetic number, because the mean of its divisors is an integer number (9899812).

Almost surely, 2^19799623 is an apocalyptic number.

19799623 is a deficient number, since it is larger than the sum of its proper divisors (1).

19799623 is an equidigital number, since it uses as much as digits as its factorization.

19799623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 46.

The square root of 19799623 is about 4449.6767298311. The cubic root of 19799623 is about 270.5322058636.

The spelling of 19799623 in words is "nineteen million, seven hundred ninety-nine thousand, six hundred twenty-three".