16681938 has 32 divisors (see below), whose sum is σ = 41064576. Its totient is φ = 4399488.

The previous prime is 16681927. The next prime is 16681939. The reversal of 16681938 is 83918661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 16681938.

It is not an unprimeable number, because it can be changed into a prime (16681939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14731 + ... + 15822.

It is an arithmetic number, because the mean of its divisors is an integer number (1283268).

Almost surely, 2^16681938 is an apocalyptic number.

16681938 is an abundant number, since it is smaller than the sum of its proper divisors (24382638).

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

16681938 is a wasteful number, since it uses less digits than its factorization.

16681938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30578.

The product of its digits is 62208, while the sum is 42.

The square root of 16681938 is about 4084.3528251120. The cubic root of 16681938 is about 255.5144707600.

The spelling of 16681938 in words is "sixteen million, six hundred eighty-one thousand, nine hundred thirty-eight".