40618309 has 2 divisors, whose sum is σ = 40618310. Its totient is φ = 40618308.

The previous prime is 40618271. The next prime is 40618327. The reversal of 40618309 is 90381604.

40618309 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., 39125025 + 1493284 = 6255^2 + 1222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40618309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40618379) 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, 20309154 + 20309155.

It is an arithmetic number, because the mean of its divisors is an integer number (20309155).

Almost surely, 2^40618309 is an apocalyptic number.

It is an amenable number.

40618309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40618309 is an equidigital number, since it uses as much as digits as its factorization.

40618309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 40618309 is about 6373.2494851528. The cubic root of 40618309 is about 343.7483427358.

The spelling of 40618309 in words is "forty million, six hundred eighteen thousand, three hundred nine".