16686889 has 4 divisors (see below), whose sum is σ = 17137924. Its totient is φ = 16235856.

The previous prime is 16686869. The next prime is 16686893. The reversal of 16686889 is 98868661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98868661 = 3181 ⋅31081.

It can be written as a sum of positive squares in 2 ways, for example, as 8323225 + 8363664 = 2885^2 + 2892^2 .

It is a cyclic number.

It is not a de Polignac number, because 16686889 - 2¹¹ = 16684841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16686869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225462 + ... + 225535.

It is an arithmetic number, because the mean of its divisors is an integer number (4284481).

Almost surely, 2^16686889 is an apocalyptic number.

It is an amenable number.

16686889 is a deficient number, since it is larger than the sum of its proper divisors (451035).

16686889 is an equidigital number, since it uses as much as digits as its factorization.

16686889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451034.

The product of its digits is 995328, while the sum is 52.

The square root of 16686889 is about 4084.9588737220. The cubic root of 16686889 is about 255.5397461410.

The spelling of 16686889 in words is "sixteen million, six hundred eighty-six thousand, eight hundred eighty-nine".