The square root of 100400400 is 10020.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a Duffinian number.
It is an unprimeable number.
Almost surely, 2100400400 is an apocalyptic number.
100400400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
100400400 is the 10020-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 100400400
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
100400400 is a wasteful number, since it uses less digits than its factorization.
100400400 is an odious number, because the sum of its binary digits is odd.
The cubic root of 100400400 is about 464.7775557627. Note that the first 3 decimals are identical.
Multiplying 100400400 by its product of nonzero digits (16), we get a square (1606406400 = 400802).
100400400 divided by its product of nonzero digits (16) gives a square (6275025 = 25052).
Adding to 100400400 its reverse (4004001), we get a palindrome (104404401).
Multiplying 100400400 by its reverse (4004001), we get a square (402003302000400 = 200500202).
The spelling of 100400400 in words is "one hundred million, four hundred thousand, four hundred".