40106909 has 2 divisors, whose sum is σ = 40106910. Its totient is φ = 40106908.

The previous prime is 40106903. The next prime is 40106953. The reversal of 40106909 is 90960104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 13118884 = 5195^2 + 3622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40106909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40106903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20053454 + 20053455.

It is an arithmetic number, because the mean of its divisors is an integer number (20053455).

Almost surely, 2^40106909 is an apocalyptic number.

It is an amenable number.

40106909 is a deficient number, since it is larger than the sum of its proper divisors (1).

40106909 is an equidigital number, since it uses as much as digits as its factorization.

40106909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 40106909 is about 6333.0015790303. The cubic root of 40106909 is about 342.2996046542.

The spelling of 40106909 in words is "forty million, one hundred six thousand, nine hundred nine".