13721244 has 24 divisors (see below), whose sum is σ = 33900048. Its totient is φ = 4304640.

The previous prime is 13721243. The next prime is 13721269. The reversal of 13721244 is 44212731.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33427 + ... + 33834.

It is an arithmetic number, because the mean of its divisors is an integer number (1412502).

Almost surely, 2^13721244 is an apocalyptic number.

It is an amenable number.

13721244 is an abundant number, since it is smaller than the sum of its proper divisors (20178804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13721244 is a wasteful number, since it uses less digits than its factorization.

13721244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67285 (or 67283 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 13721244 is about 3704.2197559000. The cubic root of 13721244 is about 239.4038677245.

Adding to 13721244 its reverse (44212731), we get a palindrome (57933975).

The spelling of 13721244 in words is "thirteen million, seven hundred twenty-one thousand, two hundred forty-four".