1155539072 has 64 divisors (see below), whose sum is σ = 2386065600. Its totient is φ = 557067264.

The previous prime is 1155539069. The next prime is 1155539087. The reversal of 1155539072 is 2709355511.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398813 + ... + 401699.

It is an arithmetic number, because the mean of its divisors is an integer number (37282275).

Almost surely, 2^1155539072 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 1155539072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193032800).

1155539072 is an abundant number, since it is smaller than the sum of its proper divisors (1230526528).

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

1155539072 is an equidigital number, since it uses as much as digits as its factorization.

1155539072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013 (or 3001 counting only the distinct ones).

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 1155539072 is about 33993.2209712466. The cubic root of 1155539072 is about 1049.3689547587.

The spelling of 1155539072 in words is "one billion, one hundred fifty-five million, five hundred thirty-nine thousand, seventy-two".