42858391 has 2 divisors, whose sum is σ = 42858392. Its totient is φ = 42858390.

The previous prime is 42858329. The next prime is 42858419. The reversal of 42858391 is 19385824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42858391 - 2¹⁷ = 42727319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42858311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21429195 + 21429196.

It is an arithmetic number, because the mean of its divisors is an integer number (21429196).

Almost surely, 2^42858391 is an apocalyptic number.

42858391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42858391 is an equidigital number, since it uses as much as digits as its factorization.

42858391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 42858391 is about 6546.6320348711. The cubic root of 42858391 is about 349.9547996051.

The spelling of 42858391 in words is "forty-two million, eight hundred fifty-eight thousand, three hundred ninety-one".