It is a happy number.
It is a plaindrome in base 10.
It is a congruent number.
21146678 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1146678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260336).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1146678 is a wasteful number, since it uses less digits than its factorization.
1146678 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 320.
The square root of 1146678 is about 1070.8305188030. The cubic root of 1146678 is about 104.6679761467.
The spelling of 1146678 in words is "one million, one hundred forty-six thousand, six hundred seventy-eight".