1161280 has 56 divisors (see below), whose sum is σ = 2926080. Its totient is φ = 437760.

The previous prime is 1161269. The next prime is 1161289. The reversal of 1161280 is 821611.

1161280 = T₁ + T₂ + ... + T₁₉₀.

1161280 is a nontrivial binomial coefficient, being equal to C(192, 3).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1161289) by changing a digit.

It is the 190-th tetrahedral 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, 5985 + ... + 6175.

2^1161280 is an apocalyptic number.

1161280 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 1161280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463040).

1161280 is an abundant number, since it is smaller than the sum of its proper divisors (1764800).

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

1161280 is a wasteful number, since it uses less digits than its factorization.

1161280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1161280 is about 1077.6270226753. The cubic root of 1161280 is about 105.1103903267.

Adding to 1161280 its reverse (821611), we get a palindrome (1982891).

It can be divided in two parts, 1161 and 280, that added together give a palindrome (1441).

The spelling of 1161280 in words is "one million, one hundred sixty-one thousand, two hundred eighty".