1321443240 has 64 divisors (see below), whose sum is σ = 4269283200. Its totient is φ = 325277952.

The previous prime is 1321443209. The next prime is 1321443251. The reversal of 1321443240 is 423441231.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1321443240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421980 + ... + 425099.

It is an arithmetic number, because the mean of its divisors is an integer number (66707550).

Almost surely, 2^1321443240 is an apocalyptic number.

1321443240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321443240 is an abundant number, since it is smaller than the sum of its proper divisors (2947839960).

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

1321443240 is a wasteful number, since it uses less digits than its factorization.

1321443240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847106 (or 847102 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1321443240 is about 36351.6607598608. The cubic root of 1321443240 is about 1097.3609574046.

Adding to 1321443240 its reverse (423441231), we get a palindrome (1744884471).

The spelling of 1321443240 in words is "one billion, three hundred twenty-one million, four hundred forty-three thousand, two hundred forty".