1155872 has 24 divisors (see below), whose sum is σ = 2333772. Its totient is φ = 563200.

The previous prime is 1155863. The next prime is 1155899. The reversal of 1155872 is 2785511.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 226576 = 964^2 + 476^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 872 + ... + 1752.

2^1155872 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 1155872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166886).

1155872 is an abundant number, since it is smaller than the sum of its proper divisors (1177900).

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

1155872 is an equidigital number, since it uses as much as digits as its factorization.

1155872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932 (or 924 counting only the distinct ones).

The product of its digits is 2800, while the sum is 29.

The square root of 1155872 is about 1075.1148775829. The cubic root of 1155872 is about 104.9469724685.

The spelling of 1155872 in words is "one million, one hundred fifty-five thousand, eight hundred seventy-two".