13779439 has 2 divisors, whose sum is σ = 13779440. Its totient is φ = 13779438.

The previous prime is 13779433. The next prime is 13779449. The reversal of 13779439 is 93497731.

It is a weak prime.

It is an emirp because it is prime and its reverse (93497731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13779439 - 2³ = 13779431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13779395 and 13779404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13779431) 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, 6889719 + 6889720.

It is an arithmetic number, because the mean of its divisors is an integer number (6889720).

Almost surely, 2^13779439 is an apocalyptic number.

13779439 is a deficient number, since it is larger than the sum of its proper divisors (1).

13779439 is an equidigital number, since it uses as much as digits as its factorization.

13779439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 43.

The square root of 13779439 is about 3712.0666750477. The cubic root of 13779439 is about 239.7418462615.

It can be divided in two parts, 1377 and 9439, that added together give a square (10816 = 104²).

The spelling of 13779439 in words is "thirteen million, seven hundred seventy-nine thousand, four hundred thirty-nine".