19397447 has 2 divisors, whose sum is σ = 19397448. Its totient is φ = 19397446.

The previous prime is 19397437. The next prime is 19397503. The reversal of 19397447 is 74479391.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19397447 - 2⁴ = 19397431 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19397398 and 19397407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19397407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9698723 + 9698724.

It is an arithmetic number, because the mean of its divisors is an integer number (9698724).

Almost surely, 2^19397447 is an apocalyptic number.

19397447 is a deficient number, since it is larger than the sum of its proper divisors (1).

19397447 is an equidigital number, since it uses as much as digits as its factorization.

19397447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 19397447 is about 4404.2532851779. The cubic root of 19397447 is about 268.6879509177.

The spelling of 19397447 in words is "nineteen million, three hundred ninety-seven thousand, four hundred forty-seven".