13644487 has 4 divisors (see below), whose sum is σ = 13695480. Its totient is φ = 13593496.

The previous prime is 13644473. The next prime is 13644539. The reversal of 13644487 is 78444631.

13644487 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.

It is a cyclic number.

It is not a de Polignac number, because 13644487 - 2¹¹ = 13642439 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 (13644427) 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, 25093 + ... + 25630.

It is an arithmetic number, because the mean of its divisors is an integer number (3423870).

Almost surely, 2^13644487 is an apocalyptic number.

13644487 is a deficient number, since it is larger than the sum of its proper divisors (50993).

13644487 is an equidigital number, since it uses as much as digits as its factorization.

13644487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50992.

The product of its digits is 64512, while the sum is 37.

The square root of 13644487 is about 3693.8444742571. The cubic root of 13644487 is about 238.9566222052.

It can be divided in two parts, 136444 and 87, that multiplied together give a triangular number (11870628 = T₄₈₇₂).

The spelling of 13644487 in words is "thirteen million, six hundred forty-four thousand, four hundred eighty-seven".