42440291 has 2 divisors, whose sum is σ = 42440292. Its totient is φ = 42440290.

The previous prime is 42440287. The next prime is 42440297. The reversal of 42440291 is 19204424.

42440291 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 is a cyclic number.

It is not a de Polignac number, because 42440291 - 2² = 42440287 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42440291.

It is not a weakly prime, because it can be changed into another prime (42440297) 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, 21220145 + 21220146.

It is an arithmetic number, because the mean of its divisors is an integer number (21220146).

Almost surely, 2^42440291 is an apocalyptic number.

42440291 is a deficient number, since it is larger than the sum of its proper divisors (1).

42440291 is an equidigital number, since it uses as much as digits as its factorization.

42440291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 42440291 is about 6514.6213243749. The cubic root of 42440291 is about 348.8130979558.

The spelling of 42440291 in words is "forty-two million, four hundred forty thousand, two hundred ninety-one".