1165113720 has 160 divisors (see below), whose sum is σ = 4022330400. Its totient is φ = 302268672.

The previous prime is 1165113713. The next prime is 1165113721. The reversal of 1165113720 is 273115611.

1165113720 is a `hidden beast` number, since 1 + 1 + 651 + 1 + 3 + 7 + 2 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165113721) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 115021 + ... + 124739.

It is an arithmetic number, because the mean of its divisors is an integer number (25139565).

Almost surely, 2^1165113720 is an apocalyptic number.

1165113720 is a gapful number since it is divisible by the number (10) 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 1165113720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2011165200).

1165113720 is an abundant number, since it is smaller than the sum of its proper divisors (2857216680).

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

1165113720 is a wasteful number, since it uses less digits than its factorization.

1165113720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9779 (or 9766 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 1165113720 is about 34133.7621717853. The cubic root of 1165113720 is about 1052.2592984173.

The spelling of 1165113720 in words is "one billion, one hundred sixty-five million, one hundred thirteen thousand, seven hundred twenty".