1320135732 has 120 divisors (see below), whose sum is σ = 3662699040. Its totient is φ = 413449920.

The previous prime is 1320135703. The next prime is 1320135743. The reversal of 1320135732 is 2375310231.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1320135696 and 1320135705.

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 805618 + ... + 807254.

It is an arithmetic number, because the mean of its divisors is an integer number (30522492).

Almost surely, 2^1320135732 is an apocalyptic number.

1320135732 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 1320135732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1831349520).

1320135732 is an abundant number, since it is smaller than the sum of its proper divisors (2342563308).

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

1320135732 is a wasteful number, since it uses less digits than its factorization.

1320135732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1792 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 1320135732 is about 36333.6721513254. The cubic root of 1320135732 is about 1096.9989083778.

Adding to 1320135732 its reverse (2375310231), we get a palindrome (3695445963).

The spelling of 1320135732 in words is "one billion, three hundred twenty million, one hundred thirty-five thousand, seven hundred thirty-two".