1109980 has 48 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 399168.

The previous prime is 1109951. The next prime is 1109987. The reversal of 1109980 is 899011.

1109980 = 23² + 24² + ... + 149².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8677 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (53760).

2^1109980 is an apocalyptic number.

1109980 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 1109980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1290240).

1109980 is an abundant number, since it is smaller than the sum of its proper divisors (1470500).

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

1109980 is a wasteful number, since it uses less digits than its factorization.

1109980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1109980 is about 1053.5558836626. Note that the first 3 decimals coincide. The cubic root of 1109980 is about 103.5392586800.

The spelling of 1109980 in words is "one million, one hundred nine thousand, nine hundred eighty".