1161985320 has 96 divisors (see below), whose sum is σ = 3780691200. Its totient is φ = 309515136.

The previous prime is 1161985313. The next prime is 1161985339. The reversal of 1161985320 is 235891611.

1161985320 is a `hidden beast` number, since 1 + 1 + 619 + 8 + 5 + 32 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 568861 + ... + 570899.

It is an arithmetic number, because the mean of its divisors is an integer number (39382200).

Almost surely, 2^1161985320 is an apocalyptic number.

1161985320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161985320 is an abundant number, since it is smaller than the sum of its proper divisors (2618705880).

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

1161985320 is a wasteful number, since it uses less digits than its factorization.

1161985320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639 (or 3632 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1161985320 is about 34087.9057731624. The cubic root of 1161985320 is about 1051.3166611906.

The spelling of 1161985320 in words is "one billion, one hundred sixty-one million, nine hundred eighty-five thousand, three hundred twenty".