1165886720 has 36 divisors (see below), whose sum is σ = 2792666100. Its totient is φ = 466354176.

The previous prime is 1165886713. The next prime is 1165886773. The reversal of 1165886720 is 276885611.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 428655616 + 737231104 = 20704^2 + 27152^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454145 + ... + 456704.

Almost surely, 2^1165886720 is an apocalyptic number.

1165886720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165886720 is an abundant number, since it is smaller than the sum of its proper divisors (1626779380).

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

1165886720 is an frugal number, since it uses more digits than its factorization.

1165886720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910870 (or 910856 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 1165886720 is about 34145.0833942458. The cubic root of 1165886720 is about 1052.4919557125.

The spelling of 1165886720 in words is "one billion, one hundred sixty-five million, eight hundred eighty-six thousand, seven hundred twenty".