13807681 has 4 divisors (see below), whose sum is σ = 13900500. Its totient is φ = 13714864.

The previous prime is 13807669. The next prime is 13807691. The reversal of 13807681 is 18670831.

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 2356225 + 11451456 = 1535^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 13807681 - 2¹⁷ = 13676609 is a prime.

It is a super-2 number, since 2×13807681² = 381304109195522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13807691) 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, 46186 + ... + 46483.

It is an arithmetic number, because the mean of its divisors is an integer number (3475125).

Almost surely, 2^13807681 is an apocalyptic number.

It is an amenable number.

13807681 is a deficient number, since it is larger than the sum of its proper divisors (92819).

13807681 is an equidigital number, since it uses as much as digits as its factorization.

13807681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92818.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 13807681 is about 3715.8688082331. The cubic root of 13807681 is about 239.9055241571.

The spelling of 13807681 in words is "thirteen million, eight hundred seven thousand, six hundred eighty-one".