40740509 has 2 divisors, whose sum is σ = 40740510. Its totient is φ = 40740508.

The previous prime is 40740499. The next prime is 40740527. The reversal of 40740509 is 90504704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24780484 + 15960025 = 4978^2 + 3995^2 .

It is a cyclic number.

It is not a de Polignac number, because 40740509 - 2¹² = 40736413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40740559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20370254 + 20370255.

It is an arithmetic number, because the mean of its divisors is an integer number (20370255).

Almost surely, 2^40740509 is an apocalyptic number.

It is an amenable number.

40740509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40740509 is an equidigital number, since it uses as much as digits as its factorization.

40740509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 40740509 is about 6382.8292316182. The cubic root of 40740509 is about 344.0927193957.

The spelling of 40740509 in words is "forty million, seven hundred forty thousand, five hundred nine".