13889321 has 2 divisors, whose sum is σ = 13889322. Its totient is φ = 13889320.

The previous prime is 13889279. The next prime is 13889327. The reversal of 13889321 is 12398831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 346921 = 3680^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 13889321 - 2⁶ = 13889257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13889327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6944660 + 6944661.

It is an arithmetic number, because the mean of its divisors is an integer number (6944661).

Almost surely, 2^13889321 is an apocalyptic number.

It is an amenable number.

13889321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13889321 is an equidigital number, since it uses as much as digits as its factorization.

13889321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 13889321 is about 3726.8379358378. The cubic root of 13889321 is about 240.3774212070.

The spelling of 13889321 in words is "thirteen million, eight hundred eighty-nine thousand, three hundred twenty-one".