42171905 has 8 divisors (see below), whose sum is σ = 50971200. Its totient is φ = 33494256.

The previous prime is 42171893. The next prime is 42171907. The reversal of 42171905 is 50917124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42171905 - 2⁴ = 42171889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42171907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29645 + ... + 31034.

It is an arithmetic number, because the mean of its divisors is an integer number (6371400).

Almost surely, 2^42171905 is an apocalyptic number.

It is an amenable number.

42171905 is a deficient number, since it is larger than the sum of its proper divisors (8799295).

42171905 is a wasteful number, since it uses less digits than its factorization.

42171905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60823.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 42171905 is about 6493.9899137587. The cubic root of 42171905 is about 348.0762620771.

The spelling of 42171905 in words is "forty-two million, one hundred seventy-one thousand, nine hundred five".