42171806 has 8 divisors (see below), whose sum is σ = 63310584. Its totient is φ = 21068280.

The previous prime is 42171791. The next prime is 42171809. The reversal of 42171806 is 60817124.

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

It is a super-2 number, since 2×42171806² = 3556922442603272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42171809) 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, 5585 + ... + 10748.

It is an arithmetic number, because the mean of its divisors is an integer number (7913823).

Almost surely, 2^42171806 is an apocalyptic number.

42171806 is a deficient number, since it is larger than the sum of its proper divisors (21138778).

42171806 is a wasteful number, since it uses less digits than its factorization.

42171806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17626.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 42171806 is about 6493.9822913217. The cubic root of 42171806 is about 348.0759897032.

It can be divided in two parts, 421 and 71806, that added together give a palindrome (72227).

The spelling of 42171806 in words is "forty-two million, one hundred seventy-one thousand, eight hundred six".