13726681 has 4 divisors (see below), whose sum is σ = 13745572. Its totient is φ = 13707792.

The previous prime is 13726673. The next prime is 13726693. The reversal of 13726681 is 18662731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7070281 + 6656400 = 2659^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 13726681 - 2³ = 13726673 is a prime.

It is a super-2 number, since 2×13726681² = 376843542551522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13726651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8310 + ... + 9823.

It is an arithmetic number, because the mean of its divisors is an integer number (3436393).

Almost surely, 2^13726681 is an apocalyptic number.

It is an amenable number.

13726681 is a deficient number, since it is larger than the sum of its proper divisors (18891).

13726681 is an equidigital number, since it uses as much as digits as its factorization.

13726681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18890.

The product of its digits is 12096, while the sum is 34.

The square root of 13726681 is about 3704.9535759575. The cubic root of 13726681 is about 239.4354845600.

The spelling of 13726681 in words is "thirteen million, seven hundred twenty-six thousand, six hundred eighty-one".