16944721 has 8 divisors (see below), whose sum is σ = 17823744. Its totient is φ = 16077600.

The previous prime is 16944703. The next prime is 16944731. The reversal of 16944721 is 12744961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16944721 - 2⁷ = 16944593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16944731) 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, 21 + ... + 5821.

It is an arithmetic number, because the mean of its divisors is an integer number (2227968).

Almost surely, 2^16944721 is an apocalyptic number.

It is an amenable number.

16944721 is a deficient number, since it is larger than the sum of its proper divisors (879023).

16944721 is a wasteful number, since it uses less digits than its factorization.

16944721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951.

The product of its digits is 12096, while the sum is 34.

The square root of 16944721 is about 4116.3966038272. The cubic root of 16944721 is about 256.8491547178.

The spelling of 16944721 in words is "sixteen million, nine hundred forty-four thousand, seven hundred twenty-one".