1165229988 has 72 divisors (see below), whose sum is σ = 2953022688. Its totient is φ = 357447168.

The previous prime is 1165229977. The next prime is 1165230019. The reversal of 1165229988 is 8899225611.

It is a self number, because there is not a number n which added to its sum of digits gives 1165229988.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 897756 + ... + 899052.

It is an arithmetic number, because the mean of its divisors is an integer number (41014204).

Almost surely, 2^1165229988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165229988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1476511344).

1165229988 is an abundant number, since it is smaller than the sum of its proper divisors (1787792700).

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

1165229988 is a wasteful number, since it uses less digits than its factorization.

1165229988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1758 counting only the distinct ones).

The product of its digits is 622080, while the sum is 51.

The square root of 1165229988 is about 34135.4652524321. The cubic root of 1165229988 is about 1052.2942992968.

The spelling of 1165229988 in words is "one billion, one hundred sixty-five million, two hundred twenty-nine thousand, nine hundred eighty-eight".