1321765260 has 24 divisors (see below), whose sum is σ = 3700942896. Its totient is φ = 352470720.

The previous prime is 1321765253. The next prime is 1321765279. The reversal of 1321765260 is 625671231.

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 7 ways as a sum of consecutive naturals, for example, 11014651 + ... + 11014770.

It is an arithmetic number, because the mean of its divisors is an integer number (154205954).

Almost surely, 2^1321765260 is an apocalyptic number.

1321765260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321765260 is an abundant number, since it is smaller than the sum of its proper divisors (2379177636).

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

1321765260 is a wasteful number, since it uses less digits than its factorization.

1321765260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22029433 (or 22029431 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 1321765260 is about 36356.0897237313. The cubic root of 1321765260 is about 1097.4500881026.

The spelling of 1321765260 in words is "one billion, three hundred twenty-one million, seven hundred sixty-five thousand, two hundred sixty".