16998986 has 8 divisors (see below), whose sum is σ = 25732740. Its totient is φ = 8421408.

The previous prime is 16998973. The next prime is 16999013. The reversal of 16998986 is 68989961.

It can be written as a sum of positive squares in 2 ways, for example, as 16556761 + 442225 = 4069^2 + 665^2 .

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

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, 38771 + ... + 39206.

Almost surely, 2^16998986 is an apocalyptic number.

16998986 is a deficient number, since it is larger than the sum of its proper divisors (8733754).

16998986 is a wasteful number, since it uses less digits than its factorization.

16998986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78088.

The product of its digits is 1679616, while the sum is 56.

The square root of 16998986 is about 4122.9826582221. The cubic root of 16998986 is about 257.1230466514.

The spelling of 16998986 in words is "sixteen million, nine hundred ninety-eight thousand, nine hundred eighty-six".