40904909 has 2 divisors, whose sum is σ = 40904910. Its totient is φ = 40904908.

The previous prime is 40904861. The next prime is 40904933. The reversal of 40904909 is 90940904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29702500 + 11202409 = 5450^2 + 3347^2 .

It is a cyclic number.

It is not a de Polignac number, because 40904909 - 2¹² = 40900813 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 (40904939) 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, 20452454 + 20452455.

It is an arithmetic number, because the mean of its divisors is an integer number (20452455).

Almost surely, 2^40904909 is an apocalyptic number.

It is an amenable number.

40904909 is a deficient number, since it is larger than the sum of its proper divisors (1).

40904909 is an equidigital number, since it uses as much as digits as its factorization.

40904909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 40904909 is about 6395.6945674414. The cubic root of 40904909 is about 344.5549368455.

The spelling of 40904909 in words is "forty million, nine hundred four thousand, nine hundred nine".