16686772 has 12 divisors (see below), whose sum is σ = 29330980. Its totient is φ = 8306496.

The previous prime is 16686767. The next prime is 16686779. The reversal of 16686772 is 27768661.

It can be written as a sum of positive squares in 2 ways, for example, as 10265616 + 6421156 = 3204^2 + 2534^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16686779) 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, 8193 + ... + 10024.

Almost surely, 2^16686772 is an apocalyptic number.

It is an amenable number.

16686772 is a deficient number, since it is larger than the sum of its proper divisors (12644208).

16686772 is a wasteful number, since it uses less digits than its factorization.

16686772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18450 (or 18448 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 16686772 is about 4084.9445528673. The cubic root of 16686772 is about 255.5391489012.

The spelling of 16686772 in words is "sixteen million, six hundred eighty-six thousand, seven hundred seventy-two".