19986116 has 12 divisors (see below), whose sum is σ = 35097132. Its totient is φ = 9958368.

The previous prime is 19986091. The next prime is 19986121. The reversal of 19986116 is 61168991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14032516 + 5953600 = 3746^2 + 2440^2 .

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, 7355 + ... + 9698.

It is an arithmetic number, because the mean of its divisors is an integer number (2924761).

Almost surely, 2^19986116 is an apocalyptic number.

It is an amenable number.

19986116 is a deficient number, since it is larger than the sum of its proper divisors (15111016).

19986116 is a wasteful number, since it uses less digits than its factorization.

19986116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17350 (or 17348 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 19986116 is about 4470.5834071181. The cubic root of 19986116 is about 271.3789354956.

It can be divided in two parts, 19986 and 116, that added together give a palindrome (20102).

The spelling of 19986116 in words is "nineteen million, nine hundred eighty-six thousand, one hundred sixteen".