1171280 has 50 divisors (see below), whose sum is σ = 2995530. Its totient is φ = 425920.

The previous prime is 1171267. The next prime is 1171301. The reversal of 1171280 is 821711.

It can be written as a sum of positive squares in only one way, i.e., 937024 + 234256 = 968^2 + 484^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a plaindrome in base 14.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 106475 + ... + 106485.

2^1171280 is an apocalyptic number.

1171280 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 1171280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1497765).

1171280 is an abundant number, since it is smaller than the sum of its proper divisors (1824250).

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

1171280 is an frugal number, since it uses more digits than its factorization.

1171280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1171280 is about 1082.2569011099. The cubic root of 1171280 is about 105.4112368554.

Multiplying 1171280 by its sum of digits (20), we get a square (23425600 = 4840²).

1171280 divided by its sum of digits (20) gives a square (58564 = 242²).

Adding to 1171280 its reverse (821711), we get a palindrome (1992991).

The spelling of 1171280 in words is "one million, one hundred seventy-one thousand, two hundred eighty".