13644189 has 24 divisors (see below), whose sum is σ = 21351512. Its totient is φ = 8346240.

The previous prime is 13644187. The next prime is 13644193. The reversal of 13644189 is 98144631.

13644189 is a `hidden beast` number, since 1 + 3 + 644 + 1 + 8 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1512900 + 12131289 = 1230^2 + 3483^2 .

It is not a de Polignac number, because 13644189 - 2¹ = 13644187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13644187) 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 23 ways as a sum of consecutive naturals, for example, 32199 + ... + 32619.

Almost surely, 2^13644189 is an apocalyptic number.

It is an amenable number.

13644189 is a deficient number, since it is larger than the sum of its proper divisors (7707323).

13644189 is a wasteful number, since it uses less digits than its factorization.

13644189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 714 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13644189 is about 3693.8041366591. The cubic root of 13644189 is about 238.9548825626.

The spelling of 13644189 in words is "thirteen million, six hundred forty-four thousand, one hundred eighty-nine".