42171868 has 12 divisors (see below), whose sum is σ = 77685160. Its totient is φ = 19976112.

The previous prime is 42171853. The next prime is 42171869. The reversal of 42171868 is 86817124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42171869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277371 + ... + 277522.

Almost surely, 2^42171868 is an apocalyptic number.

It is an amenable number.

42171868 is a deficient number, since it is larger than the sum of its proper divisors (35513292).

42171868 is a wasteful number, since it uses less digits than its factorization.

42171868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554916 (or 554914 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 42171868 is about 6493.9870649702. The cubic root of 42171868 is about 348.0761602808.

The spelling of 42171868 in words is "forty-two million, one hundred seventy-one thousand, eight hundred sixty-eight".