1155041280 has 288 divisors, whose sum is σ = 4078226880. Its totient is φ = 302284800.

The previous prime is 1155041273. The next prime is 1155041287. The reversal of 1155041280 is 821405511.

It is an interprime number because it is at equal distance from previous prime (1155041273) and next prime (1155041287).

It is a tau number, because it is divible by the number of its divisors (288).

It is not an unprimeable number, because it can be changed into a prime (1155041287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7649205 + ... + 7649355.

It is an arithmetic number, because the mean of its divisors is an integer number (14160510).

Almost surely, 2^1155041280 is an apocalyptic number.

1155041280 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 1155041280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2039113440).

1155041280 is an abundant number, since it is smaller than the sum of its proper divisors (2923185600).

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

1155041280 is a wasteful number, since it uses less digits than its factorization.

1155041280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 1155041280 is about 33985.8982520692. The cubic root of 1155041280 is about 1049.2182480420.

Adding to 1155041280 its reverse (821405511), we get a palindrome (1976446791).

The spelling of 1155041280 in words is "one billion, one hundred fifty-five million, forty-one thousand, two hundred eighty".