13408689 has 16 divisors (see below), whose sum is σ = 20985728. Its totient is φ = 7454592.

The previous prime is 13408687. The next prime is 13408721. The reversal of 13408689 is 98680431.

13408689 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13408689 - 2¹ = 13408687 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (13408687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7852 + ... + 9405.

It is an arithmetic number, because the mean of its divisors is an integer number (1311608).

Almost surely, 2^13408689 is an apocalyptic number.

It is an amenable number.

13408689 is a deficient number, since it is larger than the sum of its proper divisors (7577039).

13408689 is a wasteful number, since it uses less digits than its factorization.

13408689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17304.

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

The square root of 13408689 is about 3661.7876781703. The cubic root of 13408689 is about 237.5721014699.

The spelling of 13408689 in words is "thirteen million, four hundred eight thousand, six hundred eighty-nine".