40320997 has 2 divisors, whose sum is σ = 40320998. Its totient is φ = 40320996.

The previous prime is 40320989. The next prime is 40321007. The reversal of 40320997 is 79902304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31741956 + 8579041 = 5634^2 + 2929^2 .

It is a cyclic number.

It is not a de Polignac number, because 40320997 - 2³ = 40320989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40320967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20160498 + 20160499.

It is an arithmetic number, because the mean of its divisors is an integer number (20160499).

Almost surely, 2^40320997 is an apocalyptic number.

It is an amenable number.

40320997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40320997 is an equidigital number, since it uses as much as digits as its factorization.

40320997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 40320997 is about 6349.8816524405. The cubic root of 40320997 is about 342.9075816254.

The spelling of 40320997 in words is "forty million, three hundred twenty thousand, nine hundred ninety-seven".