16685489 has 4 divisors (see below), whose sum is σ = 16791924. Its totient is φ = 16579056.

The previous prime is 16685447. The next prime is 16685507. The reversal of 16685489 is 98458661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98458661 = 7 ⋅14065523.

It can be written as a sum of positive squares in 2 ways, for example, as 12816400 + 3869089 = 3580^2 + 1967^2 .

It is a cyclic number.

It is not a de Polignac number, because 16685489 - 2²⁰ = 15636913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16685989) 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, 52982 + ... + 53295.

It is an arithmetic number, because the mean of its divisors is an integer number (4197981).

Almost surely, 2^16685489 is an apocalyptic number.

It is an amenable number.

16685489 is a deficient number, since it is larger than the sum of its proper divisors (106435).

16685489 is a wasteful number, since it uses less digits than its factorization.

16685489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106434.

The product of its digits is 414720, while the sum is 47.

The square root of 16685489 is about 4084.7875097733. The cubic root of 16685489 is about 255.5325994993.

The spelling of 16685489 in words is "sixteen million, six hundred eighty-five thousand, four hundred eighty-nine".