13878539 has 4 divisors (see below), whose sum is σ = 13894056. Its totient is φ = 13863024.

The previous prime is 13878523. The next prime is 13878563. The reversal of 13878539 is 93587831.

It is a happy number.

13878539 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, and also an emirpimes, since its reverse is a distinct semiprime: 93587831 = 97 ⋅964823.

It is a cyclic number.

It is not a de Polignac number, because 13878539 - 2⁴ = 13878523 is a prime.

It is a super-2 number, since 2×13878539² = 385227689549042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13878539.

It is not an unprimeable number, because it can be changed into a prime (13878509) 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, 6329 + ... + 8234.

It is an arithmetic number, because the mean of its divisors is an integer number (3473514).

Almost surely, 2^13878539 is an apocalyptic number.

13878539 is a deficient number, since it is larger than the sum of its proper divisors (15517).

13878539 is an equidigital number, since it uses as much as digits as its factorization.

13878539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15516.

The product of its digits is 181440, while the sum is 44.

The square root of 13878539 is about 3725.3911204060. The cubic root of 13878539 is about 240.3152050558.

The spelling of 13878539 in words is "thirteen million, eight hundred seventy-eight thousand, five hundred thirty-nine".