13879729 has 2 divisors, whose sum is σ = 13879730. Its totient is φ = 13879728.

The previous prime is 13879727. The next prime is 13879739. The reversal of 13879729 is 92797831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12439729 + 1440000 = 3527^2 + 1200^2 .

It is a cyclic number.

It is not a de Polignac number, because 13879729 - 2¹ = 13879727 is a prime.

It is a super-2 number, since 2×13879729² = 385293754226882, which contains 22 as substring.

Together with 13879727, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13879721) 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, 6939864 + 6939865.

It is an arithmetic number, because the mean of its divisors is an integer number (6939865).

Almost surely, 2^13879729 is an apocalyptic number.

It is an amenable number.

13879729 is a deficient number, since it is larger than the sum of its proper divisors (1).

13879729 is an equidigital number, since it uses as much as digits as its factorization.

13879729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 13879729 is about 3725.5508317563. The cubic root of 13879729 is about 240.3220733801.

The spelling of 13879729 in words is "thirteen million, eight hundred seventy-nine thousand, seven hundred twenty-nine".