13743721 has 4 divisors (see below), whose sum is σ = 13909392. Its totient is φ = 13578052.

The previous prime is 13743661. The next prime is 13743731. The reversal of 13743721 is 12734731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12734731 = 19 ⋅670249.

It is a cyclic number.

It is not a de Polignac number, because 13743721 - 2⁹ = 13743209 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 13743721.

It is not an unprimeable number, because it can be changed into a prime (13743731) 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 3 ways as a sum of consecutive naturals, for example, 82711 + ... + 82876.

It is an arithmetic number, because the mean of its divisors is an integer number (3477348).

Almost surely, 2^13743721 is an apocalyptic number.

It is an amenable number.

13743721 is a deficient number, since it is larger than the sum of its proper divisors (165671).

13743721 is an equidigital number, since it uses as much as digits as its factorization.

13743721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165670.

The product of its digits is 3528, while the sum is 28.

The square root of 13743721 is about 3707.2524866807. The cubic root of 13743721 is about 239.5345202398.

The spelling of 13743721 in words is "thirteen million, seven hundred forty-three thousand, seven hundred twenty-one".