16734721 has 4 divisors (see below), whose sum is σ = 16837552. Its totient is φ = 16631892.

The previous prime is 16734713. The next prime is 16734727. The reversal of 16734721 is 12743761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16734721 - 2³ = 16734713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16734727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51171 + ... + 51496.

It is an arithmetic number, because the mean of its divisors is an integer number (4209388).

Almost surely, 2^16734721 is an apocalyptic number.

It is an amenable number.

16734721 is a deficient number, since it is larger than the sum of its proper divisors (102831).

16734721 is a wasteful number, since it uses less digits than its factorization.

16734721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102830.

The product of its digits is 7056, while the sum is 31.

The square root of 16734721 is about 4090.8093331271. The cubic root of 16734721 is about 255.7836765081.

The spelling of 16734721 in words is "sixteen million, seven hundred thirty-four thousand, seven hundred twenty-one".