40867909 has 2 divisors, whose sum is σ = 40867910. Its totient is φ = 40867908.

The previous prime is 40867907. The next prime is 40867913. The reversal of 40867909 is 90976804.

40867909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 1555009 = 6270^2 + 1247^2 .

It is a cyclic number.

It is not a de Polignac number, because 40867909 - 2¹ = 40867907 is a prime.

Together with 40867907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40867903) 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, 20433954 + 20433955.

It is an arithmetic number, because the mean of its divisors is an integer number (20433955).

Almost surely, 2^40867909 is an apocalyptic number.

It is an amenable number.

40867909 is a deficient number, since it is larger than the sum of its proper divisors (1).

40867909 is an equidigital number, since it uses as much as digits as its factorization.

40867909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 40867909 is about 6392.8013421348. The cubic root of 40867909 is about 344.4510179537.

The spelling of 40867909 in words is "forty million, eight hundred sixty-seven thousand, nine hundred nine".