Adding to 42123424 its reverse (42432124), we get a palindrome (84555548).
It is a happy number.
It is an unprimeable number.
Almost surely, 242123424 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 42123424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47706624).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
42123424 is a wasteful number, since it uses less digits than its factorization.
42123424 is an odious number, because the sum of its binary digits is odd.
The square root of 42123424 is about 6490.2560812344. The cubic root of 42123424 is about 347.9428276184.
The spelling of 42123424 in words is "forty-two million, one hundred twenty-three thousand, four hundred twenty-four".