13840609 has 4 divisors (see below), whose sum is σ = 13912516. Its totient is φ = 13768704.

The previous prime is 13840597. The next prime is 13840613. The reversal of 13840609 is 90604831.

13840609 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 an emirpimes, since its reverse is a distinct semiprime: 90604831 = 197 ⋅459923.

It can be written as a sum of positive squares in 2 ways, for example, as 3504384 + 10336225 = 1872^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 13840609 - 2⁵ = 13840577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13840709) 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, 35664 + ... + 36049.

It is an arithmetic number, because the mean of its divisors is an integer number (3478129).

Almost surely, 2^13840609 is an apocalyptic number.

It is an amenable number.

13840609 is a deficient number, since it is larger than the sum of its proper divisors (71907).

13840609 is an equidigital number, since it uses as much as digits as its factorization.

13840609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71906.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 13840609 is about 3720.2968967543. The cubic root of 13840609 is about 240.0960784302.

The spelling of 13840609 in words is "thirteen million, eight hundred forty thousand, six hundred nine".