13978281 has 12 divisors (see below), whose sum is σ = 19671792. Its totient is φ = 8827704.

The previous prime is 13978271. The next prime is 13978297. The reversal of 13978281 is 18287931.

13978281 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 13978281 - 2⁵ = 13978249 is a prime.

It is a super-2 number, since 2×13978281² = 390784679429922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13978271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5371 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (1639316).

Almost surely, 2^13978281 is an apocalyptic number.

It is an amenable number.

13978281 is a deficient number, since it is larger than the sum of its proper divisors (5693511).

13978281 is a wasteful number, since it uses less digits than its factorization.

13978281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12948 (or 12929 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 13978281 is about 3738.7539368084. The cubic root of 13978281 is about 240.8895288646.

The spelling of 13978281 in words is "thirteen million, nine hundred seventy-eight thousand, two hundred eighty-one".