42039871 has 2 divisors, whose sum is σ = 42039872. Its totient is φ = 42039870.

The previous prime is 42039869. The next prime is 42039889. The reversal of 42039871 is 17893024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42039871 - 2¹ = 42039869 is a prime.

Together with 42039869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42039841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21019935 + 21019936.

It is an arithmetic number, because the mean of its divisors is an integer number (21019936).

Almost surely, 2^42039871 is an apocalyptic number.

42039871 is a deficient number, since it is larger than the sum of its proper divisors (1).

42039871 is an equidigital number, since it uses as much as digits as its factorization.

42039871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 42039871 is about 6483.8160831412. The cubic root of 42039871 is about 347.7126238741.

The spelling of 42039871 in words is "forty-two million, thirty-nine thousand, eight hundred seventy-one".