42365891 has 2 divisors, whose sum is σ = 42365892. Its totient is φ = 42365890.

The previous prime is 42365867. The next prime is 42365923. The reversal of 42365891 is 19856324.

It is a happy number.

42365891 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 42365891 - 2¹⁴ = 42349507 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42365821) 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, 21182945 + 21182946.

It is an arithmetic number, because the mean of its divisors is an integer number (21182946).

Almost surely, 2^42365891 is an apocalyptic number.

42365891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42365891 is an equidigital number, since it uses as much as digits as its factorization.

42365891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 42365891 is about 6508.9085874669. The cubic root of 42365891 is about 348.6091496671.

The spelling of 42365891 in words is "forty-two million, three hundred sixty-five thousand, eight hundred ninety-one".