13723281 has 24 divisors (see below), whose sum is σ = 23290176. Its totient is φ = 7676640.

The previous prime is 13723279. The next prime is 13723289. The reversal of 13723281 is 18232731.

It is not a de Polignac number, because 13723281 - 2¹ = 13723279 is a prime.

It is a super-2 number, since 2×13723281² = 376656882809922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13723289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4045 + ... + 6618.

It is an arithmetic number, because the mean of its divisors is an integer number (970424).

Almost surely, 2^13723281 is an apocalyptic number.

13723281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13723281 is a deficient number, since it is larger than the sum of its proper divisors (9566895).

13723281 is a wasteful number, since it uses less digits than its factorization.

13723281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10693 (or 10690 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 13723281 is about 3704.4947023852. The cubic root of 13723281 is about 239.4157141127.

The spelling of 13723281 in words is "thirteen million, seven hundred twenty-three thousand, two hundred eighty-one".