19788247 has 2 divisors, whose sum is σ = 19788248. Its totient is φ = 19788246.

The previous prime is 19788233. The next prime is 19788313. The reversal of 19788247 is 74288791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19788247 - 2¹¹ = 19786199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19788197 and 19788206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19788227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9894123 + 9894124.

It is an arithmetic number, because the mean of its divisors is an integer number (9894124).

Almost surely, 2^19788247 is an apocalyptic number.

19788247 is a deficient number, since it is larger than the sum of its proper divisors (1).

19788247 is an equidigital number, since it uses as much as digits as its factorization.

19788247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 19788247 is about 4448.3982510562. The cubic root of 19788247 is about 270.4803839345.

The spelling of 19788247 in words is "nineteen million, seven hundred eighty-eight thousand, two hundred forty-seven".