13840689 has 4 divisors (see below), whose sum is σ = 18454256. Its totient is φ = 9227124.

The previous prime is 13840661. The next prime is 13840693. The reversal of 13840689 is 98604831.

13840689 is digitally balanced in base 3, 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13840689 - 2¹¹ = 13838641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13040689) 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 3 ways as a sum of consecutive naturals, for example, 2306779 + ... + 2306784.

It is an arithmetic number, because the mean of its divisors is an integer number (4613564).

Almost surely, 2^13840689 is an apocalyptic number.

It is an amenable number.

13840689 is a deficient number, since it is larger than the sum of its proper divisors (4613567).

13840689 is an equidigital number, since it uses as much as digits as its factorization.

13840689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4613566.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 13840689 is about 3720.3076485689. The cubic root of 13840689 is about 240.0965410219.

The spelling of 13840689 in words is "thirteen million, eight hundred forty thousand, six hundred eighty-nine".