1109538 has 28 divisors (see below), whose sum is σ = 2498598. Its totient is φ = 369360.

The previous prime is 1109533. The next prime is 1109561. The reversal of 1109538 is 8359011.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 729 = 1053^2 + 27^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1109531) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1078 + ... + 1838.

2^1109538 is an apocalyptic number.

1109538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1109538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249299).

1109538 is an abundant number, since it is smaller than the sum of its proper divisors (1389060).

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

1109538 is an frugal number, since it uses more digits than its factorization.

1109538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1109538 is about 1053.3460969691. The cubic root of 1109538 is about 103.5255135590.

The spelling of 1109538 in words is "one million, one hundred nine thousand, five hundred thirty-eight".