Adding to 42000000 its reverse (24), we get a palindrome (42000024).
It is a tau number, because it is divible by the number of its divisors (224).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a nialpdrome in base 10.
It is an unprimeable number.
Almost surely, 242000000 is an apocalyptic number.
42000000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 42000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79686480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
42000000 is an frugal number, since it uses more digits than its factorization.
42000000 is an odious number, because the sum of its binary digits is odd.
The square root of 42000000 is about 6480.7406984079. The cubic root of 42000000 is about 347.6026644886.