13844221 has 2 divisors, whose sum is σ = 13844222. Its totient is φ = 13844220.

The previous prime is 13844209. The next prime is 13844227. The reversal of 13844221 is 12244831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13060996 + 783225 = 3614^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 13844221 - 2⁵ = 13844189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13844227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6922110 + 6922111.

It is an arithmetic number, because the mean of its divisors is an integer number (6922111).

Almost surely, 2^13844221 is an apocalyptic number.

It is an amenable number.

13844221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13844221 is an equidigital number, since it uses as much as digits as its factorization.

13844221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 13844221 is about 3720.7823102138. The cubic root of 13844221 is about 240.1169626656.

The spelling of 13844221 in words is "thirteen million, eight hundred forty-four thousand, two hundred twenty-one".