42219887 has 2 divisors, whose sum is σ = 42219888. Its totient is φ = 42219886.

The previous prime is 42219839. The next prime is 42219893. The reversal of 42219887 is 78891224.

42219887 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 is a cyclic number.

It is not a de Polignac number, because 42219887 - 2¹² = 42215791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42219817) 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, 21109943 + 21109944.

It is an arithmetic number, because the mean of its divisors is an integer number (21109944).

Almost surely, 2^42219887 is an apocalyptic number.

42219887 is a deficient number, since it is larger than the sum of its proper divisors (1).

42219887 is an equidigital number, since it uses as much as digits as its factorization.

42219887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 42219887 is about 6497.6832024961. The cubic root of 42219887 is about 348.2082224828.

The spelling of 42219887 in words is "forty-two million, two hundred nineteen thousand, eight hundred eighty-seven".