1721460 has 48 divisors (see below), whose sum is σ = 5193216. Its totient is φ = 423552.

The previous prime is 1721453. The next prime is 1721477. The reversal of 1721460 is 641271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324 + ... + 1883.

It is an arithmetic number, because the mean of its divisors is an integer number (108192).

2^1721460 is an apocalyptic number.

1721460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2596608).

1721460 is an abundant number, since it is smaller than the sum of its proper divisors (3471756).

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

1721460 is a wasteful number, since it uses less digits than its factorization.

1721460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232 (or 2230 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1721460 is about 1312.0442065723. The cubic root of 1721460 is about 119.8484197202.

The spelling of 1721460 in words is "one million, seven hundred twenty-one thousand, four hundred sixty".