42172144 has 30 divisors (see below), whose sum is σ = 95050464. Its totient is φ = 18073440.

The previous prime is 42172139. The next prime is 42172157. The reversal of 42172144 is 44127124.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26112 + ... + 27679.

Almost surely, 2^42172144 is an apocalyptic number.

It is an amenable number.

42172144 is an abundant number, since it is smaller than the sum of its proper divisors (52878320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42172144 is a wasteful number, since it uses less digits than its factorization.

42172144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53813 (or 53800 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 42172144 is about 6494.0083153627. The cubic root of 42172144 is about 348.0769196244.

Adding to 42172144 its reverse (44127124), we get a palindrome (86299268).

The spelling of 42172144 in words is "forty-two million, one hundred seventy-two thousand, one hundred forty-four".