19796209 has 2 divisors, whose sum is σ = 19796210. Its totient is φ = 19796208.

The previous prime is 19796207. The next prime is 19796219. The reversal of 19796209 is 90269791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10705984 + 9090225 = 3272^2 + 3015^2 .

It is a cyclic number.

It is not a de Polignac number, because 19796209 - 2¹ = 19796207 is a prime.

Together with 19796207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19796201) 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, 9898104 + 9898105.

It is an arithmetic number, because the mean of its divisors is an integer number (9898105).

Almost surely, 2^19796209 is an apocalyptic number.

It is an amenable number.

19796209 is a deficient number, since it is larger than the sum of its proper divisors (1).

19796209 is an equidigital number, since it uses as much as digits as its factorization.

19796209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 19796209 is about 4449.2930899189. The cubic root of 19796209 is about 270.5166559035.

The spelling of 19796209 in words is "nineteen million, seven hundred ninety-six thousand, two hundred nine".