1155515872 has 48 divisors (see below), whose sum is σ = 2608375392. Its totient is φ = 493608960.

The previous prime is 1155515861. The next prime is 1155515887. The reversal of 1155515872 is 2785155511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61872 + ... + 78352.

It is an arithmetic number, because the mean of its divisors is an integer number (54341154).

Almost surely, 2^1155515872 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 1155515872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1304187696).

1155515872 is an abundant number, since it is smaller than the sum of its proper divisors (1452859520).

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

1155515872 is a wasteful number, since it uses less digits than its factorization.

1155515872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16811 (or 16803 counting only the distinct ones).

The product of its digits is 70000, while the sum is 40.

The square root of 1155515872 is about 33992.8797250248. The cubic root of 1155515872 is about 1049.3619319116.

The spelling of 1155515872 in words is "one billion, one hundred fifty-five million, five hundred fifteen thousand, eight hundred seventy-two".