1155520872 has 192 divisors, whose sum is σ = 3805963200. Its totient is φ = 312145920.

The previous prime is 1155520871. The next prime is 1155520903. The reversal of 1155520872 is 2780255511.

1155520872 is a `hidden beast` number, since 1 + 1 + 55 + 520 + 87 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1155520871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 253558 + ... + 258074.

It is an arithmetic number, because the mean of its divisors is an integer number (19822725).

Almost surely, 2^1155520872 is an apocalyptic number.

1155520872 is a gapful number since it is divisible by the number (12) 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 1155520872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1902981600).

1155520872 is an abundant number, since it is smaller than the sum of its proper divisors (2650442328).

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

1155520872 is a wasteful number, since it uses less digits than its factorization.

1155520872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576 (or 4569 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The square root of 1155520872 is about 33992.9532697587. The cubic root of 1155520872 is about 1049.3634454641.

The spelling of 1155520872 in words is "one billion, one hundred fifty-five million, five hundred twenty thousand, eight hundred seventy-two".