1109812 has 18 divisors (see below), whose sum is σ = 2135714. Its totient is φ = 504240.

The previous prime is 1109791. The next prime is 1109813. The reversal of 1109812 is 2189011.

It can be written as a sum of positive squares in only one way, i.e., 853776 + 256036 = 924^2 + 506^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 663 + ... + 1630.

2^1109812 is an apocalyptic number.

It is an amenable number.

1109812 is a deficient number, since it is larger than the sum of its proper divisors (1025902).

1109812 is a wasteful number, since it uses less digits than its factorization.

1109812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319 (or 2306 counting only the distinct ones).

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

The square root of 1109812 is about 1053.4761506555. The cubic root of 1109812 is about 103.5340347200.

The spelling of 1109812 in words is "one million, one hundred nine thousand, eight hundred twelve".