1865166 has 8 divisors (see below), whose sum is σ = 3730344. Its totient is φ = 621720.

The previous prime is 1865161. The next prime is 1865179. The reversal of 1865166 is 6615681.

It is a sphenic number, since it is the product of 3 distinct primes.

1865166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1865161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155425 + ... + 155436.

It is an arithmetic number, because the mean of its divisors is an integer number (466293).

2^1865166 is an apocalyptic number.

1865166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1865166 is a wasteful number, since it uses less digits than its factorization.

1865166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310866.

The product of its digits is 8640, while the sum is 33.

The square root of 1865166 is about 1365.7108039406. The cubic root of 1865166 is about 123.0946459054.

The spelling of 1865166 in words is "one million, eight hundred sixty-five thousand, one hundred sixty-six".