1865106 has 40 divisors (see below), whose sum is σ = 4334220. Its totient is φ = 598752.

The previous prime is 1865081. The next prime is 1865107. The reversal of 1865106 is 6015681.

1865106 is a `hidden beast` number, since 1 + 8 + 651 + 0 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1846881 + 18225 = 1359^2 + 135^2 .

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

It is an Ulam number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1865106.

It is not an unprimeable number, because it can be changed into a prime (1865107) 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 19 ways as a sum of consecutive naturals, for example, 4500 + ... + 4896.

2^1865106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1865106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2167110).

1865106 is an abundant number, since it is smaller than the sum of its proper divisors (2469114).

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

1865106 is a wasteful number, since it uses less digits than its factorization.

1865106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1865106 is about 1365.6888371807. The cubic root of 1865106 is about 123.0933259589.

The spelling of 1865106 in words is "one million, eight hundred sixty-five thousand, one hundred six".