It is a happy number.
It is an Ulam number.
It is a congruent number.
It is an unprimeable number.
21222864 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1222864 is a wasteful number, since it uses less digits than its factorization.
1222864 is an evil number, because the sum of its binary digits is even.
The square root of 1222864 is about 1105.8318136136. The cubic root of 1222864 is about 106.9365215822.
The spelling of 1222864 in words is "one million, two hundred twenty-two thousand, eight hundred sixty-four".