19768321 has 2 divisors, whose sum is σ = 19768322. Its totient is φ = 19768320.

The previous prime is 19768289. The next prime is 19768351. The reversal of 19768321 is 12386791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19360000 + 408321 = 4400^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 19768321 - 2⁵ = 19768289 is a prime.

It is not a weakly prime, because it can be changed into another prime (19768351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9884160 + 9884161.

It is an arithmetic number, because the mean of its divisors is an integer number (9884161).

Almost surely, 2^19768321 is an apocalyptic number.

It is an amenable number.

19768321 is a deficient number, since it is larger than the sum of its proper divisors (1).

19768321 is an equidigital number, since it uses as much as digits as its factorization.

19768321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 19768321 is about 4446.1580043899. The cubic root of 19768321 is about 270.3895656796.

The spelling of 19768321 in words is "nineteen million, seven hundred sixty-eight thousand, three hundred twenty-one".