1323443440 has 40 divisors (see below), whose sum is σ = 3356736048. Its totient is φ = 481251840.

The previous prime is 1323443419. The next prime is 1323443453. The reversal of 1323443440 is 443443231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1323443399 and 1323443408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751077 + ... + 752836.

Almost surely, 2^1323443440 is an apocalyptic number.

1323443440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323443440 is an abundant number, since it is smaller than the sum of its proper divisors (2033292608).

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

1323443440 is a wasteful number, since it uses less digits than its factorization.

1323443440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503937 (or 1503931 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 1323443440 is about 36379.1621673727. The cubic root of 1323443440 is about 1097.9143510464.

Adding to 1323443440 its reverse (443443231), we get a palindrome (1766886671).

The spelling of 1323443440 in words is "one billion, three hundred twenty-three million, four hundred forty-three thousand, four hundred forty".