13681586 has 4 divisors (see below), whose sum is σ = 20522382. Its totient is φ = 6840792.

The previous prime is 13681541. The next prime is 13681589. The reversal of 13681586 is 68518631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68518631 = 2137 ⋅32063.

It can be written as a sum of positive squares in only one way, i.e., 13653025 + 28561 = 3695^2 + 169^2 .

It is not an unprimeable number, because it can be changed into a prime (13681589) 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 as a sum of consecutive naturals, namely, 3420395 + ... + 3420398.

Almost surely, 2^13681586 is an apocalyptic number.

13681586 is a deficient number, since it is larger than the sum of its proper divisors (6840796).

13681586 is an equidigital number, since it uses as much as digits as its factorization.

13681586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840795.

The product of its digits is 34560, while the sum is 38.

The square root of 13681586 is about 3698.8627982124. The cubic root of 13681586 is about 239.1729984659.

The spelling of 13681586 in words is "thirteen million, six hundred eighty-one thousand, five hundred eighty-six".