19687693 has 2 divisors, whose sum is σ = 19687694. Its totient is φ = 19687692.

The previous prime is 19687639. The next prime is 19687709. The reversal of 19687693 is 39678691.

Together with previous prime (19687639) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17197609 + 2490084 = 4147^2 + 1578^2 .

It is a cyclic number.

It is not a de Polignac number, because 19687693 - 2⁹ = 19687181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19687193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9843846 + 9843847.

It is an arithmetic number, because the mean of its divisors is an integer number (9843847).

Almost surely, 2^19687693 is an apocalyptic number.

It is an amenable number.

19687693 is a deficient number, since it is larger than the sum of its proper divisors (1).

19687693 is an equidigital number, since it uses as much as digits as its factorization.

19687693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 19687693 is about 4437.0815859076. The cubic root of 19687693 is about 270.0214569139.

The spelling of 19687693 in words is "nineteen million, six hundred eighty-seven thousand, six hundred ninety-three".