19927289 has 2 divisors, whose sum is σ = 19927290. Its totient is φ = 19927288.

The previous prime is 19927279. The next prime is 19927301. The reversal of 19927289 is 98272991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 258064 = 4435^2 + 508^2 .

It is an emirp because it is prime and its reverse (98272991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19927289 - 2⁴ = 19927273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19927279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9963644 + 9963645.

It is an arithmetic number, because the mean of its divisors is an integer number (9963645).

Almost surely, 2^19927289 is an apocalyptic number.

It is an amenable number.

19927289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19927289 is an equidigital number, since it uses as much as digits as its factorization.

19927289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 19927289 is about 4463.9992159498. Note that the first 3 decimals coincide. The cubic root of 19927289 is about 271.1124155195.

The spelling of 19927289 in words is "nineteen million, nine hundred twenty-seven thousand, two hundred eighty-nine".