1721344 has 33 divisors (see below), whose sum is σ = 3526981. Its totient is φ = 839680.

The previous prime is 1721339. The next prime is 1721347. The reversal of 1721344 is 4431271.

The square root of 1721344 is 1312.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 82944 + 1638400 = 288^2 + 1280^2 .

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (1721347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 41964 + ... + 42004.

2^1721344 is an apocalyptic number.

1721344 is the 1312-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721344

1721344 is an abundant number, since it is smaller than the sum of its proper divisors (1805637).

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

1721344 is an frugal number, since it uses more digits than its factorization.

1721344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 43 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The cubic root of 1721344 is about 119.8457276780.

The spelling of 1721344 in words is "one million, seven hundred twenty-one thousand, three hundred forty-four".