42865187 has 2 divisors, whose sum is σ = 42865188. Its totient is φ = 42865186.

The previous prime is 42865171. The next prime is 42865217. The reversal of 42865187 is 78156824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42865187 - 2⁴ = 42865171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42865117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21432593 + 21432594.

It is an arithmetic number, because the mean of its divisors is an integer number (21432594).

Almost surely, 2^42865187 is an apocalyptic number.

42865187 is a deficient number, since it is larger than the sum of its proper divisors (1).

42865187 is an equidigital number, since it uses as much as digits as its factorization.

42865187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 42865187 is about 6547.1510598122. The cubic root of 42865187 is about 349.9732959218.

The spelling of 42865187 in words is "forty-two million, eight hundred sixty-five thousand, one hundred eighty-seven".