13878587 has 4 divisors (see below), whose sum is σ = 13886040. Its totient is φ = 13871136.

The previous prime is 13878563. The next prime is 13878619. The reversal of 13878587 is 78587831.

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 not a de Polignac number, because 13878587 - 2⁶ = 13878523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13878187) 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, 1763 + ... + 5555.

It is an arithmetic number, because the mean of its divisors is an integer number (3471510).

Almost surely, 2^13878587 is an apocalyptic number.

13878587 is a deficient number, since it is larger than the sum of its proper divisors (7453).

13878587 is an equidigital number, since it uses as much as digits as its factorization.

13878587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7452.

The product of its digits is 376320, while the sum is 47.

The square root of 13878587 is about 3725.3975626770. The cubic root of 13878587 is about 240.3154821050.

The spelling of 13878587 in words is "thirteen million, eight hundred seventy-eight thousand, five hundred eighty-seven".