42172 has 12 divisors (see below), whose sum is σ = 79576. Its totient is φ = 19440.

The previous prime is 42169. The next prime is 42179. The reversal of 42172 is 27124.

42172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42179) 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, 354 + ... + 457.

2⁴²¹⁷² is an apocalyptic number.

It is an amenable number.

42172 is a deficient number, since it is larger than the sum of its proper divisors (37404).

42172 is a wasteful number, since it uses less digits than its factorization.

42172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 826 counting only the distinct ones).

The product of its digits is 112, while the sum is 16.

The square root of 42172 is about 205.3582235996. The cubic root of 42172 is about 34.8076523446.

Adding to 42172 its reverse (27124), we get a palindrome (69296).

The spelling of 42172 in words is "forty-two thousand, one hundred seventy-two", and thus it is an iban number.