1223343440 has 80 divisors (see below), whose sum is σ = 3142298880. Its totient is φ = 439196160.

The previous prime is 1223343439. The next prime is 1223343449. The reversal of 1223343440 is 443433221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223343449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60722 + ... + 78318.

It is an arithmetic number, because the mean of its divisors is an integer number (39278736).

Almost surely, 2^1223343440 is an apocalyptic number.

1223343440 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 practical number, because each smaller number is the sum of distinct divisors of 1223343440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1571149440).

1223343440 is an abundant number, since it is smaller than the sum of its proper divisors (1918955440).

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

1223343440 is a wasteful number, since it uses less digits than its factorization.

1223343440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17700 (or 17694 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 1223343440 is about 34976.3268511718. The cubic root of 1223343440 is about 1069.5049504858.

Adding to 1223343440 its reverse (443433221), we get a palindrome (1666776661).

The spelling of 1223343440 in words is "one billion, two hundred twenty-three million, three hundred forty-three thousand, four hundred forty".