40207309 has 2 divisors, whose sum is σ = 40207310. Its totient is φ = 40207308.

The previous prime is 40207291. The next prime is 40207313. The reversal of 40207309 is 90370204.

40207309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27405225 + 12802084 = 5235^2 + 3578^2 .

It is a cyclic number.

It is not a de Polignac number, because 40207309 - 2²³ = 31818701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40207319) 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, 20103654 + 20103655.

It is an arithmetic number, because the mean of its divisors is an integer number (20103655).

Almost surely, 2^40207309 is an apocalyptic number.

It is an amenable number.

40207309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40207309 is an equidigital number, since it uses as much as digits as its factorization.

40207309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 40207309 is about 6340.9233554743. The cubic root of 40207309 is about 342.5849939134.

The spelling of 40207309 in words is "forty million, two hundred seven thousand, three hundred nine".