42087171 has 32 divisors (see below), whose sum is σ = 67829760. Its totient is φ = 22692384.

The previous prime is 42087169. The next prime is 42087187. The reversal of 42087171 is 17178024.

It is not a de Polignac number, because 42087171 - 2¹ = 42087169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42087151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37606 + ... + 38708.

It is an arithmetic number, because the mean of its divisors is an integer number (2119680).

Almost surely, 2^42087171 is an apocalyptic number.

42087171 is a deficient number, since it is larger than the sum of its proper divisors (25742589).

42087171 is a wasteful number, since it uses less digits than its factorization.

42087171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 42087171 is about 6487.4626010483. The cubic root of 42087171 is about 347.8429814160.

The spelling of 42087171 in words is "forty-two million, eighty-seven thousand, one hundred seventy-one".