13721344 has 144 divisors (see below), whose sum is σ = 36628480. Its totient is φ = 4976640.

The previous prime is 13721341. The next prime is 13721353. The reversal of 13721344 is 44312731.

Its product of digits (2016) is a multiple of the sum of its prime divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442609 + ... + 442639.

Almost surely, 2^13721344 is an apocalyptic number.

13721344 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13721344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18314240).

13721344 is an abundant number, since it is smaller than the sum of its proper divisors (22907136).

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

13721344 is a wasteful number, since it uses less digits than its factorization.

13721344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 72 counting only the distinct ones).

The product of its digits is 2016, while the sum is 25.

The square root of 13721344 is about 3704.2332539947. The cubic root of 13721344 is about 239.4044493124.

The spelling of 13721344 in words is "thirteen million, seven hundred twenty-one thousand, three hundred forty-four".