It is a congruent number.
It is an unprimeable number.
2123100 is an apocalyptic number.
123100 is a gapful number since it is divisible by the number (10) 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.
123100 is a wasteful number, since it uses less digits than its factorization.
123100 is an odious number, because the sum of its binary digits is odd.
The square root of 123100 is about 350.8560958570. The cubic root of 123100 is about 49.7453721611.
Adding to 123100 its reverse (1321), we get a palindrome (124421).
The spelling of 123100 in words is "one hundred twenty-three thousand, one hundred", and thus it is an iban number.