1323440440 has 96 divisors (see below), whose sum is σ = 3591946080. Its totient is φ = 429836544.

The previous prime is 1323440423. The next prime is 1323440477. The reversal of 1323440440 is 440443231.

It is a congruent 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, 94534 + ... + 107626.

It is an arithmetic number, because the mean of its divisors is an integer number (37416105).

Almost surely, 2^1323440440 is an apocalyptic number.

1323440440 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 1323440440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1795973040).

1323440440 is an abundant number, since it is smaller than the sum of its proper divisors (2268505640).

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

1323440440 is a wasteful number, since it uses less digits than its factorization.

1323440440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13149 (or 13126 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 1323440440 is about 36379.1209349539. The cubic root of 1323440440 is about 1097.9135214566.

Adding to 1323440440 its reverse (440443231), we get a palindrome (1763883671).

The spelling of 1323440440 in words is "one billion, three hundred twenty-three million, four hundred forty thousand, four hundred forty".