1243344420 has 72 divisors (see below), whose sum is σ = 3969987840. Its totient is φ = 314107200.

The previous prime is 1243344413. The next prime is 1243344451. The reversal of 1243344420 is 244433421.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 178356 + ... + 185195.

It is an arithmetic number, because the mean of its divisors is an integer number (55138720).

Almost surely, 2^1243344420 is an apocalyptic number.

1243344420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243344420 is an abundant number, since it is smaller than the sum of its proper divisors (2726643420).

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

1243344420 is a wasteful number, since it uses less digits than its factorization.

1243344420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363585 (or 363580 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 1243344420 is about 35261.0893195318. The cubic root of 1243344420 is about 1075.3020733936.

Adding to 1243344420 its reverse (244433421), we get a palindrome (1487777841).

The spelling of 1243344420 in words is "one billion, two hundred forty-three million, three hundred forty-four thousand, four hundred twenty".