19768213 has 2 divisors, whose sum is σ = 19768214. Its totient is φ = 19768212.

The previous prime is 19768211. The next prime is 19768219. The reversal of 19768213 is 31286791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11142244 + 8625969 = 3338^2 + 2937^2 .

It is an emirp because it is prime and its reverse (31286791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19768213 - 2¹ = 19768211 is a prime.

Together with 19768211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19768211) 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, 9884106 + 9884107.

It is an arithmetic number, because the mean of its divisors is an integer number (9884107).

Almost surely, 2^19768213 is an apocalyptic number.

It is an amenable number.

19768213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19768213 is an equidigital number, since it uses as much as digits as its factorization.

19768213 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 19768213 is about 4446.1458590559. The cubic root of 19768213 is about 270.3890732735.

The spelling of 19768213 in words is "nineteen million, seven hundred sixty-eight thousand, two hundred thirteen".