19887049 has 16 divisors (see below), whose sum is σ = 24780672. Its totient is φ = 15539328.

The previous prime is 19887041. The next prime is 19887061. The reversal of 19887049 is 94078891.

It is a happy number.

It is not a de Polignac number, because 19887049 - 2³ = 19887041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19887041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6237 + ... + 8869.

It is an arithmetic number, because the mean of its divisors is an integer number (1548792).

Almost surely, 2^19887049 is an apocalyptic number.

It is an amenable number.

19887049 is a deficient number, since it is larger than the sum of its proper divisors (4893623).

19887049 is a wasteful number, since it uses less digits than its factorization.

19887049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 19887049 is about 4459.4897690207. The cubic root of 19887049 is about 270.9298030355.

The spelling of 19887049 in words is "nineteen million, eight hundred eighty-seven thousand, forty-nine".