1224400 has 30 divisors (see below), whose sum is σ = 2942582.
Its totient is φ = 489600.
The previous prime is 1224389. The next prime is 1224403. The reversal of 1224400 is 44221.
Adding to 1224400 its reverse (44221), we get a palindrome (1268621).
It can be written as a sum of positive squares in 3 ways, for example, as 318096 + 906304 = 564^2 + 952^2
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1224403) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1131 + ... + 1930.
21224400 is an apocalyptic number.
1224400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
1224400 is an abundant number, since it is smaller than the sum of its proper divisors (1718182).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1224400 is a wasteful number, since it uses less digits than its factorization.
1224400 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3079 (or 3068 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 13.
The square root of 1224400 is about 1106.5260954898.
The cubic root of 1224400 is about 106.9812760203.
The spelling of 1224400 in words is "one million, two hundred twenty-four thousand, four hundred".