It is a sphenic number, since it is the product of 3 distinct primes.
1645422 is an admirable number.
It is a congruent number.
21645422 is an apocalyptic number.
1645422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1645422 is a wasteful number, since it uses less digits than its factorization.
1645422 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 274242.
The square root of 1645422 is about 1282.7400360167. The cubic root of 1645422 is about 118.0571876396.
The spelling of 1645422 in words is "one million, six hundred forty-five thousand, four hundred twenty-two".