1323120440 has 32 divisors (see below), whose sum is σ = 3014712000. Its totient is φ = 522547584.

The previous prime is 1323120427. The next prime is 1323120467. The reversal of 1323120440 is 440213231.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 206195 + ... + 212514.

It is an arithmetic number, because the mean of its divisors is an integer number (94209750).

Almost surely, 2^1323120440 is an apocalyptic number.

1323120440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323120440 is an abundant number, since it is smaller than the sum of its proper divisors (1691591560).

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

1323120440 is a wasteful number, since it uses less digits than its factorization.

1323120440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418799 (or 418795 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1323120440 is about 36374.7225418971. The cubic root of 1323120440 is about 1097.8250246778.

Adding to 1323120440 its reverse (440213231), we get a palindrome (1763333671).

The spelling of 1323120440 in words is "one billion, three hundred twenty-three million, one hundred twenty thousand, four hundred forty".