1721144 has 8 divisors (see below), whose sum is σ = 3227160. Its totient is φ = 860568.

The previous prime is 1721143. The next prime is 1721147. The reversal of 1721144 is 4411271.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107564 + ... + 107579.

It is an arithmetic number, because the mean of its divisors is an integer number (403395).

2^1721144 is an apocalyptic number.

It is an amenable number.

1721144 is a deficient number, since it is larger than the sum of its proper divisors (1506016).

1721144 is a wasteful number, since it uses less digits than its factorization.

1721144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215149 (or 215145 counting only the distinct ones).

The product of its digits is 224, while the sum is 20.

The square root of 1721144 is about 1311.9237782737. The cubic root of 1721144 is about 119.8410859419.

The spelling of 1721144 in words is "one million, seven hundred twenty-one thousand, one hundred forty-four".