16686940 has 24 divisors (see below), whose sum is σ = 36887760. Its totient is φ = 6323328.

The previous prime is 16686931. The next prime is 16686947. The reversal of 16686940 is 4968661.

It is a junction number, because it is equal to n+sod(n) for n = 16686893 and 16686902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16686947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21577 + ... + 22336.

It is an arithmetic number, because the mean of its divisors is an integer number (1536990).

Almost surely, 2^16686940 is an apocalyptic number.

16686940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16686940 is an abundant number, since it is smaller than the sum of its proper divisors (20200820).

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

16686940 is a wasteful number, since it uses less digits than its factorization.

16686940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43941 (or 43939 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 16686940 is about 4084.9651161301. The cubic root of 16686940 is about 255.5400064754.

The spelling of 16686940 in words is "sixteen million, six hundred eighty-six thousand, nine hundred forty".