1320809860 has 24 divisors (see below), whose sum is σ = 2815102080. Its totient is φ = 520437984.

The previous prime is 1320809857. The next prime is 1320809911. The reversal of 1320809860 is 689080231.

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 7 ways as a sum of consecutive naturals, for example, 491500 + ... + 494179.

It is an arithmetic number, because the mean of its divisors is an integer number (117295920).

Almost surely, 2^1320809860 is an apocalyptic number.

1320809860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320809860 is an abundant number, since it is smaller than the sum of its proper divisors (1494292220).

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

1320809860 is a wasteful number, since it uses less digits than its factorization.

1320809860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985755 (or 985753 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1320809860 is about 36342.9478716298. The cubic root of 1320809860 is about 1097.1856042908.

The spelling of 1320809860 in words is "one billion, three hundred twenty million, eight hundred nine thousand, eight hundred sixty".