40776809 has 2 divisors, whose sum is σ = 40776810. Its totient is φ = 40776808.

The previous prime is 40776767. The next prime is 40776839. The reversal of 40776809 is 90867704.

40776809 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., 24552025 + 16224784 = 4955^2 + 4028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40776809 is a prime.

It is not a weakly prime, because it can be changed into another prime (40776839) 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, 20388404 + 20388405.

It is an arithmetic number, because the mean of its divisors is an integer number (20388405).

Almost surely, 2^40776809 is an apocalyptic number.

It is an amenable number.

40776809 is a deficient number, since it is larger than the sum of its proper divisors (1).

40776809 is an equidigital number, since it uses as much as digits as its factorization.

40776809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 40776809 is about 6385.6721650896. The cubic root of 40776809 is about 344.1948851772.

The spelling of 40776809 in words is "forty million, seven hundred seventy-six thousand, eight hundred nine".