1224213440 has 56 divisors (see below), whose sum is σ = 2982986160. Its totient is φ = 478291968.

The previous prime is 1224213427. The next prime is 1224213457. The reversal of 1224213440 is 443124221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30725 + ... + 58244.

It is an arithmetic number, because the mean of its divisors is an integer number (53267610).

Almost surely, 2^1224213440 is an apocalyptic number.

1224213440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1224213440 is an abundant number, since it is smaller than the sum of its proper divisors (1758772720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1224213440 is an equidigital number, since it uses as much as digits as its factorization.

1224213440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89029 (or 89019 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1224213440 is about 34988.7616242702. The cubic root of 1224213440 is about 1069.7584221851.

Adding to 1224213440 its reverse (443124221), we get a palindrome (1667337661).

The spelling of 1224213440 in words is "one billion, two hundred twenty-four million, two hundred thirteen thousand, four hundred forty".