40007321 has 2 divisors, whose sum is σ = 40007322. Its totient is φ = 40007320.

The previous prime is 40007309. The next prime is 40007353. The reversal of 40007321 is 12370004.

It is a happy number.

40007321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 1132096 = 6235^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 40007321 - 2⁶ = 40007257 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40007321.

It is not a weakly prime, because it can be changed into another prime (40007371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20003660 + 20003661.

It is an arithmetic number, because the mean of its divisors is an integer number (20003661).

Almost surely, 2^40007321 is an apocalyptic number.

It is an amenable number.

40007321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40007321 is an equidigital number, since it uses as much as digits as its factorization.

40007321 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 40007321 is about 6325.1340697253. The cubic root of 40007321 is about 342.0160526191.

Adding to 40007321 its reverse (12370004), we get a palindrome (52377325).

The spelling of 40007321 in words is "forty million, seven thousand, three hundred twenty-one".