42040109 has 2 divisors, whose sum is σ = 42040110. Its totient is φ = 42040108.

The previous prime is 42040093. The next prime is 42040121. The reversal of 42040109 is 90104024.

42040109 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., 41964484 + 75625 = 6478^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 42040109 - 2⁴ = 42040093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42040199) 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, 21020054 + 21020055.

It is an arithmetic number, because the mean of its divisors is an integer number (21020055).

Almost surely, 2^42040109 is an apocalyptic number.

It is an amenable number.

42040109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42040109 is an equidigital number, since it uses as much as digits as its factorization.

42040109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 42040109 is about 6483.8344365044. The cubic root of 42040109 is about 347.7132800405.

The spelling of 42040109 in words is "forty-two million, forty thousand, one hundred nine".