13683987 has 6 divisors (see below), whose sum is σ = 19765772. Its totient is φ = 9122652.

The previous prime is 13683977. The next prime is 13683991. The reversal of 13683987 is 78938631.

It is a happy number.

It is not a de Polignac number, because 13683987 - 2⁸ = 13683731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13683907) 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 5 ways as a sum of consecutive naturals, for example, 760213 + ... + 760230.

Almost surely, 2^13683987 is an apocalyptic number.

13683987 is a deficient number, since it is larger than the sum of its proper divisors (6081785).

13683987 is a wasteful number, since it uses less digits than its factorization.

13683987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520449 (or 1520446 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 13683987 is about 3699.1873431877. The cubic root of 13683987 is about 239.1869885783.

The spelling of 13683987 in words is "thirteen million, six hundred eighty-three thousand, nine hundred eighty-seven".