13878915 has 16 divisors (see below), whose sum is σ = 22428576. Its totient is φ = 7328000.

The previous prime is 13878883. The next prime is 13878923. The reversal of 13878915 is 51987831.

13878915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13878915 - 2⁵ = 13878883 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3066 + ... + 6095.

It is an arithmetic number, because the mean of its divisors is an integer number (1401786).

Almost surely, 2^13878915 is an apocalyptic number.

13878915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13878915 is a deficient number, since it is larger than the sum of its proper divisors (8549661).

13878915 is a wasteful number, since it uses less digits than its factorization.

13878915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9270.

The product of its digits is 60480, while the sum is 42.

The square root of 13878915 is about 3725.4415845642. The cubic root of 13878915 is about 240.3173752578.

The spelling of 13878915 in words is "thirteen million, eight hundred seventy-eight thousand, nine hundred fifteen".