13409689 has 4 divisors (see below), whose sum is σ = 13662756. Its totient is φ = 13156624.

The previous prime is 13409681. The next prime is 13409717. The reversal of 13409689 is 98690431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12369289 + 1040400 = 3517^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 13409689 - 2³ = 13409681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13409681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126454 + ... + 126559.

It is an arithmetic number, because the mean of its divisors is an integer number (3415689).

Almost surely, 2^13409689 is an apocalyptic number.

It is an amenable number.

13409689 is a deficient number, since it is larger than the sum of its proper divisors (253067).

13409689 is an equidigital number, since it uses as much as digits as its factorization.

13409689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253066.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 13409689 is about 3661.9242209527. The cubic root of 13409689 is about 237.5780072472.

The spelling of 13409689 in words is "thirteen million, four hundred nine thousand, six hundred eighty-nine".