1100280 has 64 divisors (see below), whose sum is σ = 3382560. Its totient is φ = 286208.

The previous prime is 1100279. The next prime is 1100303. The reversal of 1100280 is 820011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6274 + ... + 6446.

2^1100280 is an apocalyptic number.

1100280 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 1100280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1691280).

1100280 is an abundant number, since it is smaller than the sum of its proper divisors (2282280).

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

1100280 is a wasteful number, since it uses less digits than its factorization.

With its successor (1100281) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (240).

1100280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1100280 is about 1048.9423244392. The cubic root of 1100280 is about 103.2367695429.

Adding to 1100280 its reverse (820011), we get a palindrome (1920291).

The spelling of 1100280 in words is "one million, one hundred thousand, two hundred eighty".