1165555240 has 64 divisors (see below), whose sum is σ = 2718781200. Its totient is φ = 449175552.

The previous prime is 1165555231. The next prime is 1165555253. The reversal of 1165555240 is 425555611.

It can be written as a sum of positive squares in 8 ways, for example, as 656691876 + 508863364 = 25626^2 + 22558^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1165555196 and 1165555205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 779934 + ... + 781426.

Almost surely, 2^1165555240 is an apocalyptic number.

1165555240 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 1165555240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1359390600).

1165555240 is an abundant number, since it is smaller than the sum of its proper divisors (1553225960).

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

1165555240 is a wasteful number, since it uses less digits than its factorization.

1165555240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206 (or 2202 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

The square root of 1165555240 is about 34140.2290560564. The cubic root of 1165555240 is about 1052.3921995650.

The spelling of 1165555240 in words is "one billion, one hundred sixty-five million, five hundred fifty-five thousand, two hundred forty".