It is an Ulam number.
It is a congruent number.
It is an unprimeable number.
42366 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
242366 is an apocalyptic number.
42366 is a gapful number since it is divisible by the number (46) formed by its first and last digit.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
42366 is a wasteful number, since it uses less digits than its factorization.
42366 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 335.
The square root of 42366 is about 205.8300269640. The cubic root of 42366 is about 34.8609448637.
The spelling of 42366 in words is "forty-two thousand, three hundred sixty-six".