19887141 has 16 divisors (see below), whose sum is σ = 27121664. Its totient is φ = 12958704.

The previous prime is 19887121. The next prime is 19887149. The reversal of 19887141 is 14178891.

It is not a de Polignac number, because 19887141 - 2¹⁴ = 19870757 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is the 4460-th Hogben number.

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 19887141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19887149) by changing a digit.

It is a nontrivial repunit in base 4459.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32460 + ... + 33066.

It is an arithmetic number, because the mean of its divisors is an integer number (1695104).

Almost surely, 2^19887141 is an apocalyptic number.

It is an amenable number.

19887141 is a deficient number, since it is larger than the sum of its proper divisors (7234523).

19887141 is a wasteful number, since it uses less digits than its factorization.

19887141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840.

The product of its digits is 16128, while the sum is 39.

The square root of 19887141 is about 4459.5000840901. The cubic root of 19887141 is about 270.9302208200.

The spelling of 19887141 in words is "nineteen million, eight hundred eighty-seven thousand, one hundred forty-one".