13387665 has 16 divisors (see below), whose sum is σ = 21542976. Its totient is φ = 7099200.

The previous prime is 13387643. The next prime is 13387667. The reversal of 13387665 is 56678331.

It is not a de Polignac number, because 13387665 - 2¹² = 13383569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13387667) 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, 250 + ... + 5180.

It is an arithmetic number, because the mean of its divisors is an integer number (1346436).

Almost surely, 2^13387665 is an apocalyptic number.

13387665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13387665 is a deficient number, since it is larger than the sum of its proper divisors (8155311).

13387665 is a wasteful number, since it uses less digits than its factorization.

13387665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120.

The product of its digits is 90720, while the sum is 39.

The square root of 13387665 is about 3658.9158230274. The cubic root of 13387665 is about 237.4478703685.

The spelling of 13387665 in words is "thirteen million, three hundred eighty-seven thousand, six hundred sixty-five".