13891878 has 128 divisors (see below), whose sum is σ = 41610240. Its totient is φ = 3317760.

The previous prime is 13891861. The next prime is 13891897. The reversal of 13891878 is 87819831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53926 + ... + 54182.

It is an arithmetic number, because the mean of its divisors is an integer number (325080).

Almost surely, 2^13891878 is an apocalyptic number.

13891878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13891878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20805120).

13891878 is an abundant number, since it is smaller than the sum of its proper divisors (27718362).

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

13891878 is a wasteful number, since it uses less digits than its factorization.

13891878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 293 counting only the distinct ones).

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

The square root of 13891878 is about 3727.1809722631. The cubic root of 13891878 is about 240.3921713245.

The spelling of 13891878 in words is "thirteen million, eight hundred ninety-one thousand, eight hundred seventy-eight".