13878918 has 16 divisors (see below), whose sum is σ = 30842160. Its totient is φ = 4626288.

The previous prime is 13878883. The next prime is 13878923. The reversal of 13878918 is 81987831.

13878918 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128455 + ... + 128562.

It is an arithmetic number, because the mean of its divisors is an integer number (1927635).

Almost surely, 2^13878918 is an apocalyptic number.

13878918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13878918 is an abundant number, since it is smaller than the sum of its proper divisors (16963242).

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

13878918 is a wasteful number, since it uses less digits than its factorization.

13878918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257028 (or 257022 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 13878918 is about 3725.4419872010. The cubic root of 13878918 is about 240.3173925731.

The spelling of 13878918 in words is "thirteen million, eight hundred seventy-eight thousand, nine hundred eighteen".