42172243 has 4 divisors (see below), whose sum is σ = 42198208. Its totient is φ = 42146280.

The previous prime is 42172219. The next prime is 42172297. The reversal of 42172243 is 34227124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42172243 - 2⁵ = 42172211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42172043) 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, 10371 + ... + 13852.

It is an arithmetic number, because the mean of its divisors is an integer number (10549552).

Almost surely, 2^42172243 is an apocalyptic number.

42172243 is a deficient number, since it is larger than the sum of its proper divisors (25965).

42172243 is a wasteful number, since it uses less digits than its factorization.

42172243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25964.

The product of its digits is 2688, while the sum is 25.

The square root of 42172243 is about 6494.0159377692. The cubic root of 42172243 is about 348.0771919968.

Adding to 42172243 its reverse (34227124), we get a palindrome (76399367).

The spelling of 42172243 in words is "forty-two million, one hundred seventy-two thousand, two hundred forty-three".