16685887 has 4 divisors (see below), whose sum is σ = 16694136. Its totient is φ = 16677640.

The previous prime is 16685869. The next prime is 16685899. The reversal of 16685887 is 78858661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78858661 = 7 ⋅11265523.

It is a cyclic number.

It is not a de Polignac number, because 16685887 - 2²³ = 8297279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16685887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16685807) 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, 1212 + ... + 5902.

It is an arithmetic number, because the mean of its divisors is an integer number (4173534).

Almost surely, 2^16685887 is an apocalyptic number.

16685887 is a deficient number, since it is larger than the sum of its proper divisors (8249).

16685887 is an equidigital number, since it uses as much as digits as its factorization.

16685887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8248.

The product of its digits is 645120, while the sum is 49.

The square root of 16685887 is about 4084.8362268272. The cubic root of 16685887 is about 255.5346312281.

The spelling of 16685887 in words is "sixteen million, six hundred eighty-five thousand, eight hundred eighty-seven".