16989818 has 4 divisors (see below), whose sum is σ = 25484730. Its totient is φ = 8494908.

The previous prime is 16989799. The next prime is 16989821. The reversal of 16989818 is 81898961.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16752649 + 237169 = 4093^2 + 487^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4247453 + ... + 4247456.

Almost surely, 2^16989818 is an apocalyptic number.

16989818 is a deficient number, since it is larger than the sum of its proper divisors (8494912).

16989818 is an equidigital number, since it uses as much as digits as its factorization.

16989818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8494911.

The product of its digits is 248832, while the sum is 50.

The square root of 16989818 is about 4121.8706918097. The cubic root of 16989818 is about 257.0768139329.

The spelling of 16989818 in words is "sixteen million, nine hundred eighty-nine thousand, eight hundred eighteen".