19987134 has 8 divisors (see below), whose sum is σ = 39974280. Its totient is φ = 6662376.

The previous prime is 19987129. The next prime is 19987151. The reversal of 19987134 is 43178991.

It is a happy number.

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

19987134 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665589 + ... + 1665600.

It is an arithmetic number, because the mean of its divisors is an integer number (4996785).

Almost surely, 2^19987134 is an apocalyptic number.

19987134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19987134 is a wasteful number, since it uses less digits than its factorization.

19987134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331194.

The product of its digits is 54432, while the sum is 42.

The square root of 19987134 is about 4470.6972610545. The cubic root of 19987134 is about 271.3835430119.

The spelling of 19987134 in words is "nineteen million, nine hundred eighty-seven thousand, one hundred thirty-four".