19889047 has 2 divisors, whose sum is σ = 19889048. Its totient is φ = 19889046.

The previous prime is 19889033. The next prime is 19889057. The reversal of 19889047 is 74098891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19889047 - 2¹⁵ = 19856279 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19888988 and 19889006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19889027) 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, 9944523 + 9944524.

It is an arithmetic number, because the mean of its divisors is an integer number (9944524).

Almost surely, 2^19889047 is an apocalyptic number.

19889047 is a deficient number, since it is larger than the sum of its proper divisors (1).

19889047 is an equidigital number, since it uses as much as digits as its factorization.

19889047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 19889047 is about 4459.7137800536. The cubic root of 19889047 is about 270.9388759355.

The spelling of 19889047 in words is "nineteen million, eight hundred eighty-nine thousand, forty-seven".