1665873 has 32 divisors (see below), whose sum is σ = 2764800. Its totient is φ = 982800.

The previous prime is 1665869. The next prime is 1665877. The reversal of 1665873 is 3785661.

It is an interprime number because it is at equal distance from previous prime (1665869) and next prime (1665877).

It is not a de Polignac number, because 1665873 - 2² = 1665869 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1665877) 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 31 ways as a sum of consecutive naturals, for example, 21048 + ... + 21126.

It is an arithmetic number, because the mean of its divisors is an integer number (86400).

2^1665873 is an apocalyptic number.

It is an amenable number.

1665873 is a deficient number, since it is larger than the sum of its proper divisors (1098927).

1665873 is a wasteful number, since it uses less digits than its factorization.

1665873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 164 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1665873 is about 1290.6870263546. The cubic root of 1665873 is about 118.5442872438.

The spelling of 1665873 in words is "one million, six hundred sixty-five thousand, eight hundred seventy-three".