1109808 has 80 divisors (see below), whose sum is σ = 3650560. Its totient is φ = 316224.

The previous prime is 1109791. The next prime is 1109813. The reversal of 1109808 is 8089011.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 2841 + ... + 3207.

It is an arithmetic number, because the mean of its divisors is an integer number (45632).

2^1109808 is an apocalyptic number.

1109808 is a gapful number since it is divisible by the number (18) 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 1109808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1825280).

1109808 is an abundant number, since it is smaller than the sum of its proper divisors (2540752).

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

1109808 is a wasteful number, since it uses less digits than its factorization.

1109808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1109808 is about 1053.4742521771. The cubic root of 1109808 is about 103.5339103336.

The spelling of 1109808 in words is "one million, one hundred nine thousand, eight hundred eight".