1181312 has 32 divisors (see below), whose sum is σ = 2570400. Its totient is φ = 536320.

The previous prime is 1181311. The next prime is 1181321. The reversal of 1181312 is 2131811.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (1181311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989 + ... + 1827.

It is an arithmetic number, because the mean of its divisors is an integer number (80325).

2^1181312 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 1181312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285200).

1181312 is an abundant number, since it is smaller than the sum of its proper divisors (1389088).

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

1181312 is an equidigital number, since it uses as much as digits as its factorization.

1181312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 852 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

The square root of 1181312 is about 1086.8817782997. The cubic root of 1181312 is about 105.7113303984.

The spelling of 1181312 in words is "one million, one hundred eighty-one thousand, three hundred twelve".