Adding to 31404223 its reverse (32240413), we get a palindrome (63644636).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-31404223 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 31404223.
It is a congruent number.
Almost surely, 231404223 is an apocalyptic number.
31404223 is a wasteful number, since it uses less digits than its factorization.
31404223 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 19325.
The square root of 31404223 is about 5603.9470911135. The cubic root of 31404223 is about 315.4975692225.
The spelling of 31404223 in words is "thirty-one million, four hundred four thousand, two hundred twenty-three".