1322431240 has 64 divisors (see below), whose sum is σ = 3216270960. Its totient is φ = 486466560.

The previous prime is 1322431237. The next prime is 1322431247. The reversal of 1322431240 is 421342231.

1322431240 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 214739716 + 1107691524 = 14654^2 + 33282^2 .

It is not an unprimeable number, because it can be changed into a prime (1322431247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139450 + ... + 148630.

Almost surely, 2^1322431240 is an apocalyptic number.

1322431240 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 1322431240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1608135480).

1322431240 is an abundant number, since it is smaller than the sum of its proper divisors (1893839720).

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

1322431240 is a wasteful number, since it uses less digits than its factorization.

1322431240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482 (or 9478 counting only the distinct ones).

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

The square root of 1322431240 is about 36365.2476961178. The cubic root of 1322431240 is about 1097.6343762697.

Adding to 1322431240 its reverse (421342231), we get a palindrome (1743773471).

The spelling of 1322431240 in words is "one billion, three hundred twenty-two million, four hundred thirty-one thousand, two hundred forty".