13871239 has 4 divisors (see below), whose sum is σ = 14008680. Its totient is φ = 13733800.

The previous prime is 13871233. The next prime is 13871279. The reversal of 13871239 is 93217831.

13871239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13871239 is a prime.

It is a super-2 number, since 2×13871239² = 384822542790242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13871233) 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, 68569 + ... + 68770.

It is an arithmetic number, because the mean of its divisors is an integer number (3502170).

Almost surely, 2^13871239 is an apocalyptic number.

13871239 is a deficient number, since it is larger than the sum of its proper divisors (137441).

13871239 is a wasteful number, since it uses less digits than its factorization.

13871239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137440.

The product of its digits is 9072, while the sum is 34.

The square root of 13871239 is about 3724.4112286374. The cubic root of 13871239 is about 240.2730630438.

The spelling of 13871239 in words is "thirteen million, eight hundred seventy-one thousand, two hundred thirty-nine".