13665687 has 16 divisors (see below), whose sum is σ = 20896512. Its totient is φ = 7781760.

The previous prime is 13665677. The next prime is 13665697. The reversal of 13665687 is 78656631.

It is an interprime number because it is at equal distance from previous prime (13665677) and next prime (13665697).

It is not a de Polignac number, because 13665687 - 2⁶ = 13665623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665607) 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 15 ways as a sum of consecutive naturals, for example, 6112 + ... + 8042.

It is an arithmetic number, because the mean of its divisors is an integer number (1306032).

Almost surely, 2^13665687 is an apocalyptic number.

13665687 is a deficient number, since it is larger than the sum of its proper divisors (7230825).

13665687 is a wasteful number, since it uses less digits than its factorization.

13665687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278.

The product of its digits is 181440, while the sum is 42.

The square root of 13665687 is about 3696.7129994091. The cubic root of 13665687 is about 239.0803170710.

The spelling of 13665687 in words is "thirteen million, six hundred sixty-five thousand, six hundred eighty-seven".