1151280 has 160 divisors (see below), whose sum is σ = 4374720. Its totient is φ = 276480.

The previous prime is 1151251. The next prime is 1151287. The reversal of 1151280 is 821511.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151287) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 28060 + ... + 28100.

It is an arithmetic number, because the mean of its divisors is an integer number (27342).

2^1151280 is an apocalyptic number.

1151280 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 1151280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2187360).

1151280 is an abundant number, since it is smaller than the sum of its proper divisors (3223440).

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

1151280 is a wasteful number, since it uses less digits than its factorization.

1151280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1151280 is about 1072.9771665790. The cubic root of 1151280 is about 104.8078117053.

Adding to 1151280 its reverse (821511), we get a palindrome (1972791).

It can be divided in two parts, 1151 and 280, that added together give a triangular number (1431 = T₅₃).

The spelling of 1151280 in words is "one million, one hundred fifty-one thousand, two hundred eighty".