1721448 has 24 divisors (see below), whose sum is σ = 4662450. Its totient is φ = 573792.

The previous prime is 1721441. The next prime is 1721449. The reversal of 1721448 is 8441271.

It can be written as a sum of positive squares in only one way, i.e., 1695204 + 26244 = 1302^2 + 162^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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 5 ways as a sum of consecutive naturals, for example, 11883 + ... + 12026.

2^1721448 is an apocalyptic number.

1721448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1721448 is an abundant number, since it is smaller than the sum of its proper divisors (2941002).

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

1721448 is a wasteful number, since it uses less digits than its factorization.

1721448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23921 (or 23914 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 1721448 is about 1312.0396335477. The cubic root of 1721448 is about 119.8481412387.

The spelling of 1721448 in words is "one million, seven hundred twenty-one thousand, four hundred forty-eight".