1724521 has 4 divisors (see below), whose sum is σ = 1728000. Its totient is φ = 1721044.

The previous prime is 1724509. The next prime is 1724537. The reversal of 1724521 is 1254271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1254271 = 547 ⋅2293.

It is a cyclic number.

It is not a de Polignac number, because 1724521 - 2¹⁹ = 1200233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1724492 and 1724501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1724551) 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, 841 + ... + 2038.

It is an arithmetic number, because the mean of its divisors is an integer number (432000).

2^1724521 is an apocalyptic number.

It is an amenable number.

1724521 is a deficient number, since it is larger than the sum of its proper divisors (3479).

1724521 is an equidigital number, since it uses as much as digits as its factorization.

1724521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3478.

The product of its digits is 560, while the sum is 22.

The square root of 1724521 is about 1313.2101888121. The cubic root of 1724521 is about 119.9194134865.

Adding to 1724521 its reverse (1254271), we get a palindrome (2978792).

The spelling of 1724521 in words is "one million, seven hundred twenty-four thousand, five hundred twenty-one".