13878671 has 4 divisors (see below), whose sum is σ = 13920192. Its totient is φ = 13837152.

The previous prime is 13878653. The next prime is 13878673. The reversal of 13878671 is 17687831.

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

It is a cyclic number.

It is not a de Polignac number, because 13878671 - 2¹⁸ = 13616527 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 (13878673) 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, 20255 + ... + 20928.

It is an arithmetic number, because the mean of its divisors is an integer number (3480048).

Almost surely, 2^13878671 is an apocalyptic number.

13878671 is a deficient number, since it is larger than the sum of its proper divisors (41521).

13878671 is an equidigital number, since it uses as much as digits as its factorization.

13878671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41520.

The product of its digits is 56448, while the sum is 41.

The square root of 13878671 is about 3725.4088366245. The cubic root of 13878671 is about 240.3159669397.

The spelling of 13878671 in words is "thirteen million, eight hundred seventy-eight thousand, six hundred seventy-one".