1321234240 has 28 divisors (see below), whose sum is σ = 3146189796. Its totient is φ = 528493568.

The previous prime is 1321234219. The next prime is 1321234247. The reversal of 1321234240 is 424321231.

It can be written as a sum of positive squares in 2 ways, for example, as 190660864 + 1130573376 = 13808^2 + 33624^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321234247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064109 + ... + 2064748.

Almost surely, 2^1321234240 is an apocalyptic number.

1321234240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321234240 is an abundant number, since it is smaller than the sum of its proper divisors (1824955556).

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

1321234240 is an equidigital number, since it uses as much as digits as its factorization.

1321234240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128874 (or 4128864 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1321234240 is about 36348.7859494647. The cubic root of 1321234240 is about 1097.3031013359.

Adding to 1321234240 its reverse (424321231), we get a palindrome (1745555471).

The spelling of 1321234240 in words is "one billion, three hundred twenty-one million, two hundred thirty-four thousand, two hundred forty".