13638489 has 4 divisors (see below), whose sum is σ = 18184656. Its totient is φ = 9092324.

The previous prime is 13638479. The next prime is 13638503. The reversal of 13638489 is 98483631.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 13638489 - 2⁴ = 13638473 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13638489.

It is not an unprimeable number, because it can be changed into a prime (13638479) 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, 2273079 + ... + 2273084.

It is an arithmetic number, because the mean of its divisors is an integer number (4546164).

Almost surely, 2^13638489 is an apocalyptic number.

It is an amenable number.

13638489 is a deficient number, since it is larger than the sum of its proper divisors (4546167).

13638489 is an equidigital number, since it uses as much as digits as its factorization.

13638489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546166.

The product of its digits is 124416, while the sum is 42.

The square root of 13638489 is about 3693.0324937644. The cubic root of 13638489 is about 238.9216026429.

The spelling of 13638489 in words is "thirteen million, six hundred thirty-eight thousand, four hundred eighty-nine".