40055909 has 2 divisors, whose sum is σ = 40055910. Its totient is φ = 40055908.

The previous prime is 40055879. The next prime is 40055957. The reversal of 40055909 is 90955004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32092225 + 7963684 = 5665^2 + 2822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40055909 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40055959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20027954 + 20027955.

It is an arithmetic number, because the mean of its divisors is an integer number (20027955).

Almost surely, 2^40055909 is an apocalyptic number.

It is an amenable number.

40055909 is a deficient number, since it is larger than the sum of its proper divisors (1).

40055909 is an equidigital number, since it uses as much as digits as its factorization.

40055909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 40055909 is about 6328.9737714735. The cubic root of 40055909 is about 342.1544535645.

The spelling of 40055909 in words is "forty million, fifty-five thousand, nine hundred nine".