13644397 has 4 divisors (see below), whose sum is σ = 14693980. Its totient is φ = 12594816.

The previous prime is 13644391. The next prime is 13644403. The reversal of 13644397 is 79344631.

13644397 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 an interprime number because it is at equal distance from previous prime (13644391) and next prime (13644403).

It can be written as a sum of positive squares in 2 ways, for example, as 820836 + 12823561 = 906^2 + 3581^2 .

It is not a de Polignac number, because 13644397 - 2⁷ = 13644269 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 (13644391) 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, 524772 + ... + 524797.

It is an arithmetic number, because the mean of its divisors is an integer number (3673495).

Almost surely, 2^13644397 is an apocalyptic number.

It is an amenable number.

13644397 is a deficient number, since it is larger than the sum of its proper divisors (1049583).

13644397 is a wasteful number, since it uses less digits than its factorization.

13644397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049582.

The product of its digits is 54432, while the sum is 37.

The square root of 13644397 is about 3693.8322918075. The cubic root of 13644397 is about 238.9560968125.

It can be divided in two parts, 13644 and 397, that added together give a palindrome (14041).

The spelling of 13644397 in words is "thirteen million, six hundred forty-four thousand, three hundred ninety-seven".