13687018 has 4 divisors (see below), whose sum is σ = 20530530. Its totient is φ = 6843508.

The previous prime is 13687013. The next prime is 13687031. The reversal of 13687018 is 81078631.

13687018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81078631 = 1021 ⋅79411.

It can be written as a sum of positive squares in only one way, i.e., 10349089 + 3337929 = 3217^2 + 1827^2 .

It is not an unprimeable number, because it can be changed into a prime (13687013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3421753 + ... + 3421756.

Almost surely, 2^13687018 is an apocalyptic number.

13687018 is a deficient number, since it is larger than the sum of its proper divisors (6843512).

13687018 is an equidigital number, since it uses as much as digits as its factorization.

13687018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6843511.

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

The square root of 13687018 is about 3699.5970050804. The cubic root of 13687018 is about 239.2046472291.

The spelling of 13687018 in words is "thirteen million, six hundred eighty-seven thousand, eighteen".