16691886 has 16 divisors (see below), whose sum is σ = 37093200. Its totient is φ = 5563944.

The previous prime is 16691839. The next prime is 16691891. The reversal of 16691886 is 68819661.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154501 + ... + 154608.

It is an arithmetic number, because the mean of its divisors is an integer number (2318325).

Almost surely, 2^16691886 is an apocalyptic number.

16691886 is an abundant number, since it is smaller than the sum of its proper divisors (20401314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16691886 is a wasteful number, since it uses less digits than its factorization.

16691886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309120 (or 309114 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 16691886 is about 4085.5704620041. The cubic root of 16691886 is about 255.5652512880.

The spelling of 16691886 in words is "sixteen million, six hundred ninety-one thousand, eight hundred eighty-six".