It is a congruent number.
21871472 is an apocalyptic number.
1871472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1871472 is a wasteful number, since it uses less digits than its factorization.
1871472 is an evil number, because the sum of its binary digits is even.
The square root of 1871472 is about 1368.0175437472. The cubic root of 1871472 is about 123.2332147472.
The spelling of 1871472 in words is "one million, eight hundred seventy-one thousand, four hundred seventy-two".