42129287 has 2 divisors, whose sum is σ = 42129288. Its totient is φ = 42129286.

The previous prime is 42129259. The next prime is 42129301. The reversal of 42129287 is 78292124.

42129287 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 42129287 - 2¹² = 42125191 is a prime.

It is equal to p_2554955 and since 42129287 and 2554955 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42125287) 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, 21064643 + 21064644.

It is an arithmetic number, because the mean of its divisors is an integer number (21064644).

Almost surely, 2^42129287 is an apocalyptic number.

42129287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42129287 is an equidigital number, since it uses as much as digits as its factorization.

42129287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 42129287 is about 6490.7077426117. The cubic root of 42129287 is about 347.9589698180.

The spelling of 42129287 in words is "forty-two million, one hundred twenty-nine thousand, two hundred eighty-seven".