19397243 has 2 divisors, whose sum is σ = 19397244. Its totient is φ = 19397242.

The previous prime is 19397219. The next prime is 19397251. The reversal of 19397243 is 34279391.

It is a strong prime.

It is an emirp because it is prime and its reverse (34279391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19397243 - 2⁶ = 19397179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19397197 and 19397206.

It is not a weakly prime, because it can be changed into another prime (19397263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9698621 + 9698622.

It is an arithmetic number, because the mean of its divisors is an integer number (9698622).

Almost surely, 2^19397243 is an apocalyptic number.

19397243 is a deficient number, since it is larger than the sum of its proper divisors (1).

19397243 is an equidigital number, since it uses as much as digits as its factorization.

19397243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 19397243 is about 4404.2301256860. The cubic root of 19397243 is about 268.6870089976.

The spelling of 19397243 in words is "nineteen million, three hundred ninety-seven thousand, two hundred forty-three".