13811439 has 4 divisors (see below), whose sum is σ = 18415256. Its totient is φ = 9207624.

The previous prime is 13811419. The next prime is 13811459. The reversal of 13811439 is 93411831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93411831 = 3 ⋅31137277.

It is an interprime number because it is at equal distance from previous prime (13811419) and next prime (13811459).

It is not a de Polignac number, because 13811439 - 2⁵ = 13811407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13811419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2301904 + ... + 2301909.

It is an arithmetic number, because the mean of its divisors is an integer number (4603814).

Almost surely, 2^13811439 is an apocalyptic number.

13811439 is a deficient number, since it is larger than the sum of its proper divisors (4603817).

13811439 is an equidigital number, since it uses as much as digits as its factorization.

13811439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4603816.

The product of its digits is 2592, while the sum is 30.

The square root of 13811439 is about 3716.3744429215. The cubic root of 13811439 is about 239.9272870001.

The spelling of 13811439 in words is "thirteen million, eight hundred eleven thousand, four hundred thirty-nine".