19688393 has 2 divisors, whose sum is σ = 19688394. Its totient is φ = 19688392.

The previous prime is 19688369. The next prime is 19688399. The reversal of 19688393 is 39388691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 5004169 = 3832^2 + 2237^2 .

It is a cyclic number.

It is not a de Polignac number, because 19688393 - 2¹⁶ = 19622857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19688399) 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, 9844196 + 9844197.

It is an arithmetic number, because the mean of its divisors is an integer number (9844197).

Almost surely, 2^19688393 is an apocalyptic number.

It is an amenable number.

19688393 is a deficient number, since it is larger than the sum of its proper divisors (1).

19688393 is an equidigital number, since it uses as much as digits as its factorization.

19688393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 19688393 is about 4437.1604658836. The cubic root of 19688393 is about 270.0246570989.

The spelling of 19688393 in words is "nineteen million, six hundred eighty-eight thousand, three hundred ninety-three".