13864439 has 4 divisors (see below), whose sum is σ = 13874424. Its totient is φ = 13854456.

The previous prime is 13864397. The next prime is 13864457. The reversal of 13864439 is 93446831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13864439 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 (13864139) 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, 2492 + ... + 5825.

It is an arithmetic number, because the mean of its divisors is an integer number (3468606).

Almost surely, 2^13864439 is an apocalyptic number.

13864439 is a deficient number, since it is larger than the sum of its proper divisors (9985).

13864439 is an equidigital number, since it uses as much as digits as its factorization.

13864439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9984.

The product of its digits is 62208, while the sum is 38.

The square root of 13864439 is about 3723.4982207596. The cubic root of 13864439 is about 240.2337941680.

It can be divided in two parts, 138644 and 39, that multiplied together give a triangular number (5407116 = T₃₂₈₈).

The spelling of 13864439 in words is "thirteen million, eight hundred sixty-four thousand, four hundred thirty-nine".