1163280 has 80 divisors (see below), whose sum is σ = 3731904. Its totient is φ = 299520.

The previous prime is 1163273. The next prime is 1163311. The reversal of 1163280 is 823611.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8815 + ... + 8945.

2^1163280 is an apocalyptic number.

1163280 is a gapful number since it is divisible by the number (10) 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 1163280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1865952).

1163280 is an abundant number, since it is smaller than the sum of its proper divisors (2568624).

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

1163280 is a wasteful number, since it uses less digits than its factorization.

1163280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1163280 is about 1078.5545883264. The cubic root of 1163280 is about 105.1706974053.

Adding to 1163280 its reverse (823611), we get a palindrome (1986891).

The spelling of 1163280 in words is "one million, one hundred sixty-three thousand, two hundred eighty".