40540109 has 2 divisors, whose sum is σ = 40540110. Its totient is φ = 40540108.

The previous prime is 40540067. The next prime is 40540111. The reversal of 40540109 is 90104504.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27071209 + 13468900 = 5203^2 + 3670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40540109 is a prime.

Together with 40540111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40540009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20270054 + 20270055.

It is an arithmetic number, because the mean of its divisors is an integer number (20270055).

Almost surely, 2^40540109 is an apocalyptic number.

It is an amenable number.

40540109 is a deficient number, since it is larger than the sum of its proper divisors (1).

40540109 is an equidigital number, since it uses as much as digits as its factorization.

40540109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 40540109 is about 6367.1115115098. Note that the first 3 decimals coincide. The cubic root of 40540109 is about 343.5276016430.

The spelling of 40540109 in words is "forty million, five hundred forty thousand, one hundred nine".