19887853 has 2 divisors, whose sum is σ = 19887854. Its totient is φ = 19887852.

The previous prime is 19887821. The next prime is 19887859. The reversal of 19887853 is 35878891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12369289 + 7518564 = 3517^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 19887853 - 2⁵ = 19887821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19887797 and 19887806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19887859) 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, 9943926 + 9943927.

It is an arithmetic number, because the mean of its divisors is an integer number (9943927).

Almost surely, 2^19887853 is an apocalyptic number.

It is an amenable number.

19887853 is a deficient number, since it is larger than the sum of its proper divisors (1).

19887853 is an equidigital number, since it uses as much as digits as its factorization.

19887853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The square root of 19887853 is about 4459.5799129514. The cubic root of 19887853 is about 270.9334540653.

The spelling of 19887853 in words is "nineteen million, eight hundred eighty-seven thousand, eight hundred fifty-three".