1131280 has 40 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 444288.

The previous prime is 1131271. The next prime is 1131307. The reversal of 1131280 is 821311.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 6231 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2^1131280 is an apocalyptic number.

1131280 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 1131280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339200).

1131280 is an abundant number, since it is smaller than the sum of its proper divisors (1547120).

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

1131280 is a wasteful number, since it uses less digits than its factorization.

1131280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1131280 is about 1063.6164722305. The cubic root of 1131280 is about 104.1973570013.

Adding to 1131280 its reverse (821311), we get a palindrome (1952591).

The spelling of 1131280 in words is "one million, one hundred thirty-one thousand, two hundred eighty".