1109128 has 8 divisors (see below), whose sum is σ = 2079630. Its totient is φ = 554560.

The previous prime is 1109123. The next prime is 1109159. The reversal of 1109128 is 8219011.

It can be written as a sum of positive squares in only one way, i.e., 1077444 + 31684 = 1038^2 + 178^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1109099 and 1109108.

It is not an unprimeable number, because it can be changed into a prime (1109123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69313 + ... + 69328.

2^1109128 is an apocalyptic number.

It is an amenable number.

1109128 is a deficient number, since it is larger than the sum of its proper divisors (970502).

1109128 is a wasteful number, since it uses less digits than its factorization.

1109128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138647 (or 138643 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1109128 is about 1053.1514610919. The cubic root of 1109128 is about 103.5127602959.

The spelling of 1109128 in words is "one million, one hundred nine thousand, one hundred twenty-eight".