1721444 has 12 divisors (see below), whose sum is σ = 3043068. Its totient is φ = 852000.

The previous prime is 1721441. The next prime is 1721449. The reversal of 1721444 is 4441271.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1658944 + 62500 = 1288^2 + 250^2 .

It is a super-3 number, since 3×1721444³ = 15303823653338089152, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1721441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1727 + ... + 2534.

It is an arithmetic number, because the mean of its divisors is an integer number (253589).

2^1721444 is an apocalyptic number.

It is an amenable number.

1721444 is a deficient number, since it is larger than the sum of its proper divisors (1321624).

1721444 is a wasteful number, since it uses less digits than its factorization.

1721444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366 (or 4364 counting only the distinct ones).

The product of its digits is 896, while the sum is 23.

The square root of 1721444 is about 1312.0381092026. The cubic root of 1721444 is about 119.8480484112.

The spelling of 1721444 in words is "one million, seven hundred twenty-one thousand, four hundred forty-four".