13956139 has 2 divisors, whose sum is σ = 13956140. Its totient is φ = 13956138.

The previous prime is 13956121. The next prime is 13956143. The reversal of 13956139 is 93165931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13956139 - 2⁷ = 13956011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13956098 and 13956107.

It is not a weakly prime, because it can be changed into another prime (13956109) 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, 6978069 + 6978070.

It is an arithmetic number, because the mean of its divisors is an integer number (6978070).

Almost surely, 2^13956139 is an apocalyptic number.

13956139 is a deficient number, since it is larger than the sum of its proper divisors (1).

13956139 is an equidigital number, since it uses as much as digits as its factorization.

13956139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 37.

The square root of 13956139 is about 3735.7916162441. The cubic root of 13956139 is about 240.7622696612.

The spelling of 13956139 in words is "thirteen million, nine hundred fifty-six thousand, one hundred thirty-nine".