19987142 has 8 divisors (see below), whose sum is σ = 34263696. Its totient is φ = 8565912.

The previous prime is 19987129. The next prime is 19987151. The reversal of 19987142 is 24178991.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19987142.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 713813 + ... + 713840.

It is an arithmetic number, because the mean of its divisors is an integer number (4282962).

Almost surely, 2^19987142 is an apocalyptic number.

19987142 is a deficient number, since it is larger than the sum of its proper divisors (14276554).

19987142 is a wasteful number, since it uses less digits than its factorization.

19987142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427662.

The product of its digits is 36288, while the sum is 41.

The square root of 19987142 is about 4470.6981557694. The cubic root of 19987142 is about 271.3835792197.

The spelling of 19987142 in words is "nineteen million, nine hundred eighty-seven thousand, one hundred forty-two".