13608989 has 4 divisors (see below), whose sum is σ = 13620924. Its totient is φ = 13597056.

The previous prime is 13608967. The next prime is 13609019. The reversal of 13608989 is 98980631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98980631 = 103 ⋅960977.

It can be written as a sum of positive squares in 2 ways, for example, as 4202500 + 9406489 = 2050^2 + 3067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13608989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13608949) 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, 4052 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (3405231).

Almost surely, 2^13608989 is an apocalyptic number.

It is an amenable number.

13608989 is a deficient number, since it is larger than the sum of its proper divisors (11935).

13608989 is a wasteful number, since it uses less digits than its factorization.

13608989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11934.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 13608989 is about 3689.0363240283. The cubic root of 13608989 is about 238.7492161191.

The spelling of 13608989 in words is "thirteen million, six hundred eight thousand, nine hundred eighty-nine".