13644649 has 8 divisors (see below), whose sum is σ = 13895720. Its totient is φ = 13395456.

The previous prime is 13644647. The next prime is 13644667. The reversal of 13644649 is 94644631.

It can be written as a sum of positive squares in 4 ways, for example, as 8037225 + 5607424 = 2835^2 + 2368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13644649 - 2¹ = 13644647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13644647) 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 7 ways as a sum of consecutive naturals, for example, 29629 + ... + 30085.

It is an arithmetic number, because the mean of its divisors is an integer number (1736965).

Almost surely, 2^13644649 is an apocalyptic number.

It is an amenable number.

13644649 is a deficient number, since it is larger than the sum of its proper divisors (251071).

13644649 is an equidigital number, since it uses as much as digits as its factorization.

13644649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939.

The product of its digits is 62208, while the sum is 37.

The square root of 13644649 is about 3693.8664025652. The cubic root of 13644649 is about 238.9575679063.

The spelling of 13644649 in words is "thirteen million, six hundred forty-four thousand, six hundred forty-nine".