1320240432 has 80 divisors (see below), whose sum is σ = 3918241280. Its totient is φ = 375238656.

The previous prime is 1320240421. The next prime is 1320240443. The reversal of 1320240432 is 2340420231.

It is an interprime number because it is at equal distance from previous prime (1320240421) and next prime (1320240443).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1320240399 and 1320240408.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 54669 + ... + 75027.

It is an arithmetic number, because the mean of its divisors is an integer number (48978016).

Almost surely, 2^1320240432 is an apocalyptic number.

1320240432 is a gapful number since it is divisible by the number (12) 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 1320240432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1959120640).

1320240432 is an abundant number, since it is smaller than the sum of its proper divisors (2598000848).

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

1320240432 is a wasteful number, since it uses less digits than its factorization.

1320240432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20570 (or 20564 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1320240432 is about 36335.1129350109. The cubic root of 1320240432 is about 1097.0279086153.

Adding to 1320240432 its reverse (2340420231), we get a palindrome (3660660663).

The spelling of 1320240432 in words is "one billion, three hundred twenty million, two hundred forty thousand, four hundred thirty-two".