740321 has 2 divisors, whose sum is σ = 740322. Its totient is φ = 740320.

The previous prime is 740303. The next prime is 740323. The reversal of 740321 is 123047.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 192721 = 740^2 + 439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740321 is a prime.

It is a Sophie Germain prime.

Together with 740323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 740321.

It is not a weakly prime, because it can be changed into another prime (740323) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370160 + 370161.

It is an arithmetic number, because the mean of its divisors is an integer number (370161).

2⁷⁴⁰³²¹ is an apocalyptic number.

It is an amenable number.

740321 is a deficient number, since it is larger than the sum of its proper divisors (1).

740321 is an equidigital number, since it uses as much as digits as its factorization.

740321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 740321 is about 860.4190839353. The cubic root of 740321 is about 90.4634937158.

Adding to 740321 its reverse (123047), we get a palindrome (863368).

The spelling of 740321 in words is "seven hundred forty thousand, three hundred twenty-one", and thus it is an iban number.