19870208 has 30 divisors (see below), whose sum is σ = 39904161. Its totient is φ = 9884672.

The previous prime is 19870187. The next prime is 19870217. The reversal of 19870208 is 80207891.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 7139584 = 3568^2 + 2672^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3152.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 100766 + ... + 100962.

Almost surely, 2^19870208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19870208

19870208 is an abundant number, since it is smaller than the sum of its proper divisors (20033953).

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

19870208 is an frugal number, since it uses more digits than its factorization.

19870208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 19870208 is about 4457.6011486000. The cubic root of 19870208 is about 270.8533040474.

The spelling of 19870208 in words is "nineteen million, eight hundred seventy thousand, two hundred eight".