13889279 has 2 divisors, whose sum is σ = 13889280. Its totient is φ = 13889278.

The previous prime is 13889269. The next prime is 13889321. The reversal of 13889279 is 97298831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13889279 - 2¹⁶ = 13823743 is a prime.

It is a super-2 number, since 2×13889279² = 385824142279682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13889219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6944639 + 6944640.

It is an arithmetic number, because the mean of its divisors is an integer number (6944640).

Almost surely, 2^13889279 is an apocalyptic number.

13889279 is a deficient number, since it is larger than the sum of its proper divisors (1).

13889279 is an equidigital number, since it uses as much as digits as its factorization.

13889279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 13889279 is about 3726.8323010299. The cubic root of 13889279 is about 240.3771789138.

The spelling of 13889279 in words is "thirteen million, eight hundred eighty-nine thousand, two hundred seventy-nine".