1155221760 has 288 divisors, whose sum is σ = 4601060352. Its totient is φ = 239984640.

The previous prime is 1155221737. The next prime is 1155221779. The reversal of 1155221760 is 671225511.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 31 ways as a sum of consecutive naturals, for example, 293727 + ... + 297633.

It is an arithmetic number, because the mean of its divisors is an integer number (15975904).

Almost surely, 2^1155221760 is an apocalyptic number.

1155221760 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 1155221760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2300530176).

1155221760 is an abundant number, since it is smaller than the sum of its proper divisors (3445838592).

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

1155221760 is a wasteful number, since it uses less digits than its factorization.

1155221760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949 (or 3935 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 1155221760 is about 33988.5533672735. The cubic root of 1155221760 is about 1049.2728934331.

The spelling of 1155221760 in words is "one billion, one hundred fifty-five million, two hundred twenty-one thousand, seven hundred sixty".