16681844 has 24 divisors (see below), whose sum is σ = 31180800. Its totient is φ = 7791840.

The previous prime is 16681843. The next prime is 16681849. The reversal of 16681844 is 44818661.

It is a junction number, because it is equal to n+sod(n) for n = 16681798 and 16681807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1277 + ... + 5915.

It is an arithmetic number, because the mean of its divisors is an integer number (1299200).

Almost surely, 2^16681844 is an apocalyptic number.

It is an amenable number.

16681844 is a deficient number, since it is larger than the sum of its proper divisors (14498956).

16681844 is a wasteful number, since it uses less digits than its factorization.

16681844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703 (or 4701 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 16681844 is about 4084.3413177647. The cubic root of 16681844 is about 255.5139908316.

The spelling of 16681844 in words is "sixteen million, six hundred eighty-one thousand, eight hundred forty-four".