13878439 has 2 divisors, whose sum is σ = 13878440. Its totient is φ = 13878438.

The previous prime is 13878427. The next prime is 13878457. The reversal of 13878439 is 93487831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13878439 - 2⁷ = 13878311 is a prime.

It is a super-2 number, since 2×13878439² = 385222138153442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13878395 and 13878404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13878419) 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, 6939219 + 6939220.

It is an arithmetic number, because the mean of its divisors is an integer number (6939220).

Almost surely, 2^13878439 is an apocalyptic number.

13878439 is a deficient number, since it is larger than the sum of its proper divisors (1).

13878439 is an equidigital number, since it uses as much as digits as its factorization.

13878439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 13878439 is about 3725.3776989723. The cubic root of 13878439 is about 240.3146278678.

The spelling of 13878439 in words is "thirteen million, eight hundred seventy-eight thousand, four hundred thirty-nine".