13944221 has 2 divisors, whose sum is σ = 13944222. Its totient is φ = 13944220.

The previous prime is 13944209. The next prime is 13944257. The reversal of 13944221 is 12244931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 5707321 = 2870^2 + 2389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13944221 is a prime.

It is a Chen prime.

It is equal to p₉₀₆₇₄₀ and since 13944221 and 906740 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13944521) 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 as a sum of consecutive naturals, namely, 6972110 + 6972111.

It is an arithmetic number, because the mean of its divisors is an integer number (6972111).

Almost surely, 2^13944221 is an apocalyptic number.

It is an amenable number.

13944221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13944221 is an equidigital number, since it uses as much as digits as its factorization.

13944221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 13944221 is about 3734.1961651740. The cubic root of 13944221 is about 240.6937162715.

The spelling of 13944221 in words is "thirteen million, nine hundred forty-four thousand, two hundred twenty-one".