13878684 has 18 divisors (see below), whose sum is σ = 35082320. Its totient is φ = 4626216.

The previous prime is 13878673. The next prime is 13878691. The reversal of 13878684 is 48687831.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192724 + ... + 192795.

Almost surely, 2^13878684 is an apocalyptic number.

It is an amenable number.

13878684 is an abundant number, since it is smaller than the sum of its proper divisors (21203636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13878684 is a wasteful number, since it uses less digits than its factorization.

13878684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385529 (or 385524 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 13878684 is about 3725.4105813990. The cubic root of 13878684 is about 240.3160419734.

The spelling of 13878684 in words is "thirteen million, eight hundred seventy-eight thousand, six hundred eighty-four".