19886871 has 8 divisors (see below), whose sum is σ = 27232624. Its totient is φ = 12899520.

The previous prime is 19886857. The next prime is 19886891. The reversal of 19886871 is 17868891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19886871 - 2¹⁰ = 19885847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19886871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19886831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89470 + ... + 89691.

It is an arithmetic number, because the mean of its divisors is an integer number (3404078).

Almost surely, 2^19886871 is an apocalyptic number.

19886871 is a deficient number, since it is larger than the sum of its proper divisors (7345753).

19886871 is a wasteful number, since it uses less digits than its factorization.

19886871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179201.

The product of its digits is 193536, while the sum is 48.

The square root of 19886871 is about 4459.4698115359. The cubic root of 19886871 is about 270.9289947097.

The spelling of 19886871 in words is "nineteen million, eight hundred eighty-six thousand, eight hundred seventy-one".