13999439 has 4 divisors (see below), whose sum is σ = 14229000. Its totient is φ = 13769880.

The previous prime is 13999423. The next prime is 13999441. The reversal of 13999439 is 93499931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13999439 - 2⁴ = 13999423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13999393 and 13999402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114689 + ... + 114810.

It is an arithmetic number, because the mean of its divisors is an integer number (3557250).

Almost surely, 2^13999439 is an apocalyptic number.

13999439 is a deficient number, since it is larger than the sum of its proper divisors (229561).

13999439 is an equidigital number, since it uses as much as digits as its factorization.

13999439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229560.

The product of its digits is 236196, while the sum is 47.

The square root of 13999439 is about 3741.5824192446. The cubic root of 13999439 is about 241.0110071131.

The spelling of 13999439 in words is "thirteen million, nine hundred ninety-nine thousand, four hundred thirty-nine".