1724321 has 2 divisors, whose sum is σ = 1724322. Its totient is φ = 1724320.

The previous prime is 1724309. The next prime is 1724329. The reversal of 1724321 is 1234271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 490000 = 1111^2 + 700^2 .

It is an emirp because it is prime and its reverse (1234271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1724321 is a prime.

It is a super-2 number, since 2×1724321² = 5946565822082, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1724293 and 1724302.

It is not a weakly prime, because it can be changed into another prime (1724329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862160 + 862161.

It is an arithmetic number, because the mean of its divisors is an integer number (862161).

2^1724321 is an apocalyptic number.

It is an amenable number.

1724321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1724321 is an equidigital number, since it uses as much as digits as its factorization.

1724321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 20.

The square root of 1724321 is about 1313.1340373321. The cubic root of 1724321 is about 119.9147774533.

Adding to 1724321 its reverse (1234271), we get a palindrome (2958592).

The spelling of 1724321 in words is "one million, seven hundred twenty-four thousand, three hundred twenty-one".