1109280 has 48 divisors (see below), whose sum is σ = 3495744. Its totient is φ = 295680.

The previous prime is 1109257. The next prime is 1109281. The reversal of 1109280 is 829011.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (1109281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676 + ... + 1635.

It is an arithmetic number, because the mean of its divisors is an integer number (72828).

2^1109280 is an apocalyptic number.

1109280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1109280 is an abundant number, since it is smaller than the sum of its proper divisors (2386464).

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

1109280 is a wasteful number, since it uses less digits than its factorization.

1109280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329 (or 2321 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1109280 is about 1053.2236229785. The cubic root of 1109280 is about 103.5174887015.

The spelling of 1109280 in words is "one million, one hundred nine thousand, two hundred eighty".