1101906 has 48 divisors (see below), whose sum is σ = 2732184. Its totient is φ = 317952.

The previous prime is 1101901. The next prime is 1101917. The reversal of 1101906 is 6091011.

It can be written as a sum of positive squares in 4 ways, for example, as 731025 + 370881 = 855^2 + 609^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1101901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3840 + ... + 4116.

2^1101906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1101906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1366092).

1101906 is an abundant number, since it is smaller than the sum of its proper divisors (1630278).

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

1101906 is a wasteful number, since it uses less digits than its factorization.

1101906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 1101906 is about 1049.7171047478. The cubic root of 1101906 is about 103.2875991395.

Adding to 1101906 its reverse (6091011), we get a palindrome (7192917).

It can be divided in two parts, 110 and 1906, that added together give a triangular number (2016 = T₆₃).

The spelling of 1101906 in words is "one million, one hundred one thousand, nine hundred six".