42172143 has 8 divisors (see below), whose sum is σ = 60554928. Its totient is φ = 25952064.

The previous prime is 42172139. The next prime is 42172157. The reversal of 42172143 is 34127124.

It is a happy number.

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

It is not a de Polignac number, because 42172143 - 2² = 42172139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540630 + ... + 540707.

It is an arithmetic number, because the mean of its divisors is an integer number (7569366).

Almost surely, 2^42172143 is an apocalyptic number.

42172143 is a deficient number, since it is larger than the sum of its proper divisors (18382785).

42172143 is a wasteful number, since it uses less digits than its factorization.

42172143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081353.

The product of its digits is 1344, while the sum is 24.

The square root of 42172143 is about 6494.0082383687. The cubic root of 42172143 is about 348.0769168732.

Adding to 42172143 its reverse (34127124), we get a palindrome (76299267).

The spelling of 42172143 in words is "forty-two million, one hundred seventy-two thousand, one hundred forty-three".