42172357 has 4 divisors (see below), whose sum is σ = 42189120. Its totient is φ = 42155596.

The previous prime is 42172331. The next prime is 42172373. The reversal of 42172357 is 75327124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42172357 - 2²³ = 33783749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172327) 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, 3757 + ... + 9922.

It is an arithmetic number, because the mean of its divisors is an integer number (10547280).

Almost surely, 2^42172357 is an apocalyptic number.

It is an amenable number.

42172357 is a deficient number, since it is larger than the sum of its proper divisors (16763).

42172357 is a wasteful number, since it uses less digits than its factorization.

42172357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16762.

The product of its digits is 11760, while the sum is 31.

The square root of 42172357 is about 6494.0247150746. The cubic root of 42172357 is about 348.0775056373.

The spelling of 42172357 in words is "forty-two million, one hundred seventy-two thousand, three hundred fifty-seven".