14066721 has 18 divisors (see below), whose sum is σ = 20714850. Its totient is φ = 9198336.

The previous prime is 14066699. The next prime is 14066747. The reversal of 14066721 is 12766041.

It can be written as a sum of positive squares in only one way, i.e., 12531600 + 1535121 = 3540^2 + 1239^2 .

It is not a de Polignac number, because 14066721 - 2⁹ = 14066209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (14066791) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31105 + ... + 31553.

It is an arithmetic number, because the mean of its divisors is an integer number (1150825).

Almost surely, 2^14066721 is an apocalyptic number.

It is an amenable number.

14066721 is a deficient number, since it is larger than the sum of its proper divisors (6648129).

14066721 is an equidigital number, since it uses as much as digits as its factorization.

14066721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 14066721 is about 3750.5627577738. The cubic root of 14066721 is about 241.3964938433.

The spelling of 14066721 in words is "fourteen million, sixty-six thousand, seven hundred twenty-one".