It is an unprimeable number.
Almost surely, 231421744 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 31421744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32836440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31421744 is a wasteful number, since it uses less digits than its factorization.
31421744 is an odious number, because the sum of its binary digits is odd.
The square root of 31421744 is about 5605.5101462757. The cubic root of 31421744 is about 315.5562323011.
The spelling of 31421744 in words is "thirty-one million, four hundred twenty-one thousand, seven hundred forty-four".