13878642 has 8 divisors (see below), whose sum is σ = 27757296. Its totient is φ = 4626212.

The previous prime is 13878619. The next prime is 13878653. The reversal of 13878642 is 24687831.

It is a sphenic number, since it is the product of 3 distinct primes.

13878642 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 13878642.

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 3 ways as a sum of consecutive naturals, for example, 1156548 + ... + 1156559.

It is an arithmetic number, because the mean of its divisors is an integer number (3469662).

Almost surely, 2^13878642 is an apocalyptic number.

13878642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13878642 is a wasteful number, since it uses less digits than its factorization.

13878642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313112.

The product of its digits is 64512, while the sum is 39.

The square root of 13878642 is about 3725.4049444322. The cubic root of 13878642 is about 240.3157995565.

The spelling of 13878642 in words is "thirteen million, eight hundred seventy-eight thousand, six hundred forty-two".