40016321 has 2 divisors, whose sum is σ = 40016322. Its totient is φ = 40016320.

The previous prime is 40016311. The next prime is 40016323. The reversal of 40016321 is 12361004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 2070721 = 6160^2 + 1439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40016321 is a prime.

It is a Sophie Germain prime.

Together with 40016323, 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 40016321.

It is not a weakly prime, because it can be changed into another prime (40016323) 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, 20008160 + 20008161.

It is an arithmetic number, because the mean of its divisors is an integer number (20008161).

Almost surely, 2^40016321 is an apocalyptic number.

It is an amenable number.

40016321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40016321 is an equidigital number, since it uses as much as digits as its factorization.

40016321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 40016321 is about 6325.8454770884. The cubic root of 40016321 is about 342.0416972062.

Adding to 40016321 its reverse (12361004), we get a palindrome (52377325).

The spelling of 40016321 in words is "forty million, sixteen thousand, three hundred twenty-one".