16489988 has 18 divisors (see below), whose sum is σ = 30170574. Its totient is φ = 7885504.

The previous prime is 16489981. The next prime is 16489999. The reversal of 16489988 is 88998461.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 103684 = 4048^2 + 322^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16489981) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 1781 + ... + 6012.

It is an arithmetic number, because the mean of its divisors is an integer number (1676143).

Almost surely, 2^16489988 is an apocalyptic number.

It is an amenable number.

16489988 is a deficient number, since it is larger than the sum of its proper divisors (13680586).

16489988 is a wasteful number, since it uses less digits than its factorization.

16489988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7843 (or 7818 counting only the distinct ones).

The product of its digits is 995328, while the sum is 53.

The square root of 16489988 is about 4060.7866233034. The cubic root of 16489988 is about 254.5306656065.

The spelling of 16489988 in words is "sixteen million, four hundred eighty-nine thousand, nine hundred eighty-eight".