13644385 has 4 divisors (see below), whose sum is σ = 16373268. Its totient is φ = 10915504.

The previous prime is 13644383. The next prime is 13644391. The reversal of 13644385 is 58344631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58344631 = 1583 ⋅36857.

It can be written as a sum of positive squares in 2 ways, for example, as 6370576 + 7273809 = 2524^2 + 2697^2 .

It is a cyclic number.

It is not a de Polignac number, because 13644385 - 2¹ = 13644383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13644385.

It is not an unprimeable number, because it can be changed into a prime (13644383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1364434 + ... + 1364443.

It is an arithmetic number, because the mean of its divisors is an integer number (4093317).

Almost surely, 2^13644385 is an apocalyptic number.

It is an amenable number.

13644385 is a deficient number, since it is larger than the sum of its proper divisors (2728883).

13644385 is an equidigital number, since it uses as much as digits as its factorization.

13644385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728882.

The product of its digits is 34560, while the sum is 34.

The square root of 13644385 is about 3693.8306674779. The cubic root of 13644385 is about 238.9560267599.

It can be divided in two parts, 136 and 44385, that added together give a square (44521 = 211²).

The spelling of 13644385 in words is "thirteen million, six hundred forty-four thousand, three hundred eighty-five".